JP2012016387A - Night cover for freezing or refrigerating showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a night cover for freezing or refrigerating show case which is superior in operability, is excellent in cold insulation, hardly causes dew condensation, and does not produce fluff, since it is hardly deformed.SOLUTION: The night cover for freezing or refrigerating the show case is made of cloth. The cloth is made of plain weave fabric and its warp or weft constituting the cloth is composed of mixed yarn formed of a hollow cross-section multifilament and a multi-leaf cross-section multifilament.

Description

  The present invention relates to a night cover that covers an opening of an open showcase that sells frozen or refrigerated products in order to maintain product hygiene during non-business hours or to save power consumption. The present invention relates to a night cover for a frozen or refrigerated showcase that is suitable for an open showcase of the type that is wound and stored.

  Conventionally, night covers for refrigerated or refrigerated showcases are required to have cold insulation to keep the air inside the case, as well as airtightness, anti-condensation, mildew-proofing, and moderate ventilation to prevent product contamination and icing. (1) resin panel, (2) resin sheet, (3) film, (4) non-woven fabric, (5) knitted fabric, (6) woven fabric, (7 ) (2) to (6) laminates have been used.

  However, in recent years, the size of showcases has increased, and accordingly, night covers can be installed and stored easily, so that the night covers can be wound around rolls and pulled out or taken up. The number of showcases for storage is increasing rapidly. Therefore, as a night cover suitable for such a type of showcase, in addition to the conventional required characteristics, a night cover excellent in durability for roll winding operability and repeated pulling and bending is eagerly desired.

On the other hand, night covers disclosed in, for example, Patent Documents 1 to 5 have been proposed as night covers corresponding to these requirements.
However, in the nonwoven fabrics and knitted fabrics used in Patent Documents 1 to 3, as apparent from the structure, the thickness becomes excessive, deforms due to tension, or meanders when repeatedly wound on a roll. Diffusion of the condensed water and the drying speed are reduced due to the wrinkles, the random fiber arrangement of the nonwoven fabric, the loop structure of the knitting yarn, and the rough gaps between the fibers and the yarn. There is a problem that the cold insulation property is lowered.

  In addition, in a knitted fabric, the warp of the fabric occurs due to the stitch structure, and the sealing performance of the showcase is lowered. In the woven fabric, the bulkiness of the nonwoven fabric and the knitted fabric is low and the cold insulation property is lowered. In the case of woven and knitted fabrics using nonwoven fabrics and spun yarns, there is also a problem that fluff falls into the showcase and the product is contaminated during repeated use.

  Moreover, in the laminated material of a nonwoven fabric and a film or sheet used in Patent Documents 4 and 5, in addition to the problem of thickness and fluff dropping similar to the nonwoven fabric, the problem of peeling between the nonwoven fabric and the film or sheet due to repeated use, Or there is a problem of condensation drying due to the lack of air permeability of the film or sheet, and the difficulty of drying water at the time of washing, and none of the night covers has yet reached a satisfactory level.

Japanese Unexamined Patent Publication No. 2000-041799 JP 2006-167284 A Utility Model Registration No. 3058051 JP-A-8-154787 Japanese Patent Laid-Open No. 9-079737

  The present invention has been made in view of the above-mentioned problems, and its purpose is that it is difficult to be deformed, so that it has excellent operability, good cold insulation, hardly causes condensation, and does not generate fluff, etc. It is to provide a night cover for the case.

The inventors of the present invention have studied the optimal fabric configuration for a frozen or refrigerated showcase, and have found that the above problem can be solved by using the following fabric.
Thus, according to the present invention, there is provided a night cover comprising a fabric, wherein the fabric comprises a plain woven fabric, and the warp or weft constituting the plain woven fabric comprises a hollow cross-section multifilament and a multi-leaf cross-section multifilament. There is provided a night cover for a frozen or refrigerated showcase, characterized by comprising a mixed yarn.

  The night cover for a frozen or refrigerated showcase according to the present invention is a plain woven fabric composed of a mixed yarn composed of a hollow cross-section multifilament and a multi-leaf cross-section multifilament, so that it has excellent dimensional stability and can be installed and stored. It has the feature that can be made easy. In addition, it has good cold insulation and breathability, hardly causes condensation, and has excellent antifungal properties.

It is a perspective view which shows an example of the showcase which uses the night cover of this invention. In the blended yarn used for the night cover of the present invention, (A) is a form of the blended yarn, and (B) is a schematic view showing an example of a cross section of the blended yarn. It is a schematic diagram which shows the example of the cross section of the fiber which comprises the textile fabric used for the night cover of this invention.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of a frozen or refrigerated showcase in which the characteristics of the night cover of the present invention are utilized, and the night cover is wound around a roll and installed in such a manner that it is drawn out or wound up. It is. Here, 1 is an open showcase, 2 is a roll that winds up the night cover, 3 is a night cover, and FIG. 1 shows a state in which the opening of the open showcase is covered by the night cover.

  The night cover for a frozen or refrigerated showcase of the present invention (hereinafter sometimes simply referred to as a night cover) can be used as the night cover of FIG. The fabric is composed of a plain woven fabric, and the warp or weft constituting the plain woven fabric is composed of a mixed fiber composed of a hollow cross-section multifilament and a multileaf cross-section multifilament.

  In the present invention, as described above, hollow and multi-leafed cross-sections are obtained by using mixed yarns having multi-filaments having different cross-sectional forms of hollow and multi-leafed, and preferably making a difference in yarn length. In addition to allowing the air layer to be taken into the fibers and between the fibers and between the woven fabrics by the thread form such as the core part and the sheath part produced by the difference in the thread length, the groove form on the side surface of the multifilament multifilament and the multi Since the efficient capillary phenomenon due to the aggregated form of the filaments works, it is possible to obtain cold insulation, appropriate air permeability, anti-condensation, quick drying, and antifungal properties, and solve the problems of the present invention. .

  The cross-sectional form of the hollow cross-section multifilament used in the present invention is not limited as long as it has a void in the cross-section in addition to the hollow cross-section as shown in FIGS. It is preferable that the hollow ratio or the ratio of voids in the cross-sectional area is 30 to 50%. This is because if the hollow ratio or the void portion is less than 30%, the heat insulating effect tends to be lowered, and if it exceeds 50%, the cross section tends to be crushed.

  On the other hand, the cross-sectional form of the multi-leaf cross-section multifilament used in the present invention can be exemplified by multi-leaf cross sections of 3, 4, and 6 leaves as shown in FIGS. The number of leaves is preferably 3 to 8, and the ratio D / L × 100 (%) of the depth D of the concave portion to the tangential length L contacting the convex portion of the adjacent two leaves in more than half of the total number of leaves is 25% or more. Is preferred. If it is less than 3 leaves, it is difficult to form a groove in the recess, and if it is more than 8 leaves, the width of the leaf becomes small and it becomes easy to tear and it is difficult to obtain a deep groove, and if the D / L ratio is less than 25%, it is highly capillary. It is difficult to obtain the action, which is not preferable.

  In the present invention, the form of the fabric needs to be a plain woven fabric, and it is preferable to use a relatively high density plain woven fabric having a total cover factor described later. As a result, compared to non-woven fabrics, knitted fabrics or those laminated with films, etc., the thickness is reduced, deformation against tension is reduced, strength is increased, and fluff fall-off can be reduced. Performance, durability against repeated pulling and bending, sealing properties to prevent contamination and freezing of products in the case, and dustproofness with less fluff falling off due to friction and the like.

The plain fabric is preferably set so that the total cover factor described below is 1400 to 1700.
Total cover factor = N1 × √D1 + N2 × √D2
Here, N1 is the warp density (main / inch), D1 is the total fineness (dtex) of the warp, N2 is the weft density (main / inch), and D2 is the total fineness (dtex) of the weft.

  That is, when the total cover factor exceeds 1700, the degree of filling of the fabric is insufficient, and the fabric tends to be deformed in an oblique direction with respect to the warp direction and the weft direction of the fabric. It is not preferable. On the other hand, if the total cover factor is less than 1400, the fabric becomes hard and the gaps between the fibers and the fabric structure are compressed, so that the roll winding property and the cold retaining property are liable to decrease, which is not preferable.

  In the above mixed fiber, the above-described effects can be further enhanced by providing a gap between the multifilament fibers. As such a method, a method of imparting crimps to the fiber by performing false twisting or the like can be adopted. However, in such a method, the multifilament is also imparted with stretchability and the woven fabric is easily deformed. A method of providing a difference in thread length between the hollow cross-section multifilament and the multi-leaf cross-section multifilament can be preferably used.

  In FIG. 2 (A), the schematic of the form of the mixed yarn which has this thread foot difference is shown. Here, 4 is a multifilament having a long yarn length, and 5 is a multifilament having a short yarn length. FIG. 2B shows an example of the mixed yarn of the present invention, in which a multifilament having a long yarn length is a four-leaf cross-sectional multifilament and a multifilament having a short yarn length is a hollow cross-sectional multifilament. FIG. In the present invention, the multifilament having a long yarn length may be a hollow cross-section multifilament, and the multifilament having a short yarn length may be a multi-leaf cross-section multifilament. A cross-linked multifilament is a mixed yarn with a multifilament arranged in the core, but it is more efficient to use a multifilament with a multileaf cross-sectional multifilament arranged in the sheath as shown in FIG. The phenomenon is easy to work.

  In this way, when a mixed yarn having a difference in yarn length is used, a multifilament having a long yarn length forms a sheath portion and a multifilament having a short yarn length forms a core portion, and a large gap is formed between the two. In addition, since the multifilament 5 of the core portion is linear, the dimensions are difficult to change with respect to pulling, and roll rollability suitable as a night cover is obtained, and appropriate air permeability is also obtained. And preferred.

  In addition, by using such a mixed fiber, an air layer effective for a large amount of heat insulation in a hollow section inside, a multi-leaf section recess, an interfiber gap formed between multifilaments having different yarn lengths, and a gap between fabric structures. Can be ensured, and high performance cold-retaining properties can be obtained even though the thickness of the nonwoven fabric or knitted fabric is small.

  Further, in addition to the effect of using multifilament cross-section multifilaments, the effect of making multifilaments composed of multifilaments having a difference in thread length further increases the capillary action generated in the gaps between the fibers of the mixed yarns and between the fabric structures. In addition to the high capillary action of the concave section of the leaf cross section, dew condensation water and washing water adhering to the fabric can be quickly diffused in the surface direction, dramatically improving dew condensation prevention performance and drying speed, and fiber Since water does not easily accumulate in the interstices, it is possible to improve cold insulation and antifungal properties.

  The thread difference between the hollow cross-section multifilament and the multi-leaf cross-section multifilament is preferably 6 to 12%. If the difference in the thread length is less than 6%, the inter-fiber voids obtained thereby are small and the cooling effect is weakened. On the other hand, if it exceeds 12%, the inter-fiber voids are coarsened and the capillary action is weakened.

  In the present invention, the hollow cross-section multifilament and the multi-leaf cross-section multifilament are preferably synthetic fibers, and good durability and dust resistance can be obtained even when subjected to repeated pulling and bending. As the synthetic fiber, a synthetic fiber made of polyester such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate or polyethylene naphthalate, nylon such as nylon 6 or nylon 66, polyolefin such as polypropylene or polyethylene, or acrylic is suitable. However, synthetic fibers having a strength and elongation conforming to these can be used, but among them, synthetic fibers made of polyester, particularly polyethylene terephthalate are preferable.

  The mixed yarn constituting the night cover of the present invention described above can be manufactured by aligning hollow cross-section multifilaments and multi-leaf cross-section multifilaments and entangled them using an air entanglement nozzle or the like.

  Moreover, the mixed fiber which has a thread difference between a hollow cross-section multifilament and a multi-leaf cross-section multifilament can be manufactured by the following method using, for example, multifilaments having different boiling water shrinkage rates.

  A multifilament having a low boiling water shrinkage (low shrinkage multifilament) can be produced by using a highly oriented undrawn yarn having a spinning speed of 2000 to 4000 m / min, so-called POY, and performing constant-length heat treatment or relaxation heat treatment. . On the other hand, for multifilaments with high boiling water shrinkage (high shrinkage multifilaments), yarns should be made using a polymer with a weaker heat set during yarn production, a higher degree of polymerization, or a polymer copolymerized with isophthalic acid. Can be manufactured.

  By aligning the above-mentioned low-shrinkage multifilament and high-shrinkage multifilament, passing through an air entanglement nozzle to provide entanglement between both filaments, twisting with a ring twisting device as necessary, and winding the present invention, Can be produced.

  The blended yarn obtained in this way does not have a difference in yarn foot during weaving, so the blended yarn can be woven smoothly and densely, and due to shrinkage differences due to scouring and heat setting after weaving. , Yarn foot difference can be expressed.

  The blended yarn is woven into a plain woven fabric with no twist or sweet twist, and then subjected to scouring and heat shrink treatment and finishing set. Here, in the case of adding twist to the mixed yarn, if the sweet twist level is exceeded, the inter-fiber gap is compressed, which is not preferable.

  As a result, a flat woven fabric having a smooth woven fabric surface, no bias against bending and bending, uniform and good roll winding properties can be obtained, and finally sewed according to the shape of the frozen or refrigerated showcase. Thus, a suitable night cover of the present invention can be obtained.

  Hereinafter, the present invention will be described in more detail based on examples. Note that the present invention is not limited to this.

(1) Dimensional stability A sample having a length of 300 mm and a width of 50 mm taken from the sample along the length direction is stretched at a test length of 200 mm and a pulling speed of 20 mm / min using a tensile tester, and the tensile load is 1 kg / width. The elongation was 50 mm, and the elongation was less than 3% as ◯, 3% or more and less than 6% as Δ, and 6% or more as x.

(2) Breathability According to JIS L1096, fragile breathability is measured, ○ is 50cc / cm ² · sec or more and less than 120cc / cm ² · sec, ○, 120cc / cm ² · sec or more and less than 300cc / cm ² · sec is △ , Less than 50 cc / cm ² · sec or 300 cc / cm ² · sec or more is indicated by x.

(3) Thermal insulation Measured according to JIS L1096, the thermal insulation (%) is 20% or more, and is less than 20%.

(4) Quick-drying A sample of 300 mm square is leveled and 1 cc of water is dropped on the center of the sample. The time until the weight of the sample returns to its original state is shown. ○ is less than 180 minutes, and more than 180 minutes is less than 360 minutes. 360 minutes or more are indicated by x.

(5) Dust proof 18 mm wide adhesive tape is pressed against the sample and peeled off, and the number of fibers attached to the adhesive tape is converted per 100 cm ² , and less than 100 is ○, 100 to less than 200 is Δ , 200 or more are indicated by ×.

(6) Yarn foot difference The mixed yarn is extracted from the woven fabric, applied with a load of 0.1 cN (0.1 g) x total fineness (dtex) of the mixed yarn, cut to a length of 5 cm, and cut. The hollow cross-section filament (single fiber) and the multi-leaf cross-section filament (single fiber) are taken out from each, and the length is measured by applying a load of 0.1 cN (0.1 g) × single fiber fineness (dtex), respectively. The thread foot difference (%) is calculated by the following formula. The length of each filament was measured for 10 filaments, and the average value was taken. In addition, the thread foot difference is indicated by an absolute value.
Yarn foot difference (%) = (LB−LA) / LA × 100
However, LA is the yarn length (cm) of the hollow cross-section filament, and LB is the yarn length (cm) of the multileaf filament.

[Example 1]
Polyethylene terephthalate was melt-spun and taken at a spinning speed of 3000 m / min. The cross-sectional shape was a 6-leaf cross section as shown in FIG. 3 (7) with D / L × 100 = 32%, and the total fineness was 124 dtex. The polyester multifilament yarn having 36 filaments was heat-treated at 120 ° C. while relaxing 1% to obtain a low heat shrink multifilament having a boiling water shrinkage of 1.5%.

On the other hand, a polyester obtained by copolymerizing 10 mol% of isophthalic acid was melt-spun, and an undrawn yarn once wound at a spinning speed of 1300 m / min was drawn and heat-set at a draw ratio of 3.1 times and a set temperature of 160 ° C. It has a hollow cross section as shown in FIG. 3 (1) with a cross section of 37% hollow rate, strength is 3.8 cN / dtex, elongation is 35%, total fineness is 138 dtex, filament count is 36, boiling water shrinkage A highly shrinkable multifilament with a rate of 13.4% was obtained.
The high shrinkage multifilament and the low heat shrinkage multifilament having a six-leaf cross section are aligned and passed through an air entanglement nozzle while giving relaxation of 1.5%, and 36 entanglements per meter are given between both filaments. This was subsequently wound around a bobbin by a ring twisting device to obtain a mixed fiber.

  Next, the blended yarn is twisted 120 times per meter and then woven into a plain fabric having a warp density of 48 yarns / inch and a weft density of 36 yarns / inch using a water jet loom. By performing shrinkage treatment with boil, drying, and finishing set at 160 ° C, the yarn length of the 6-leaf cross-section multifilament is longer than the yarn length of the hollow cross-section multifilament, and the difference in yarn foot is 10.7%. A plain woven fabric having a factor of 1631 was obtained. The results are shown in Table 1.

[Comparative Examples 1-3]
Instead of the woven fabric of Example 1, a tricot knitted fabric (Comparative Example 1) using a polyester multifilament having a total fineness of 167 dtex, a filament number of 48, and a cross-sectional shape of a round cross section, a fineness of raw cotton of 1.7 dtex, a cross section Polyester needle punched non-woven fabric having a round cross section (Comparative Example 2), a resin sheet obtained by coating a vinyl base resin on a woven fabric using a polyester multifilament having a total fineness of 400 dtex, 96 filaments, and a circular cross section. Example 1 was repeated except that (Comparative Example 3) was used. The results are shown in Table 1.

[Comparative Example 4]
Polyester multifilament with a total fineness of 275 dtex, 72 filaments, strength of 4.6 cN / dtex, elongation of 37%, and round cross-section of the fiber, 120 twists per meter, water jet Weaving into a plain fabric with a warp density of 52 yarns / inch and a weft density of 39 yarns / inch using a room, followed by scouring, drying, and finishing set at 160 ° C. to obtain a plain fabric with a total cover factor of 1632 It was. The results are shown in Table 1.

[Comparative Example 5]
A spun yarn having a raw cotton fineness of 1.7 dtex, a raw cotton cross-sectional shape made of polyester short fiber having a round cross-section, a fineness of 286 dtex (≈ 20th), a strength of 3.4 cN / dtex, and an elongation of 39% is used. In a rapier room, weaved into a plain fabric with a warp density of 54 / inch and a weft density of 41 / inch, and then subjected to scouring, drying, and finishing set at 160 ° C. to obtain a plain fabric with a total cover factor of 1632. . The results are shown in Table 1.

  A night cover of 1.2 m × 2 m was prepared using the plain fabric described in Example 1, and was installed as the night cover 3 of the open showcase shown in FIG. 1, and the drawer and roll take-up and storage were repeated 30 times. In the roll winding and storing property (easiness of storing in the winding roll 2), the roll winding property and the roll wrinkle, good results were obtained.

  Further, as is apparent from Table 1, the plain fabric of Example 1 is superior in comparison with the fabrics of Comparative Examples 1 and 2 and has excellent dimensional stability, and has excellent handling properties such as roll take-up and storage as described above. That it is. Also, the fabrics of Comparative Examples 1 to 5 have good heat retention, that is, cold insulation, moderate air permeability, and excellent quick-drying properties, so that condensation is unlikely to occur and mildewproof. Is excellent. In addition, it can be said that it is an optimal material for a night cover for a frozen or refrigerated showcase without causing fuzz to occur and without fouling the product.

  Since the night cover of the present invention is not easily deformed, it is excellent in operability. In addition, the product has good cold insulation, is resistant to dew condensation, has excellent antifungal properties, and does not generate fluff and the like, so that the product can be kept clean. For this reason, it can be suitably used for a frozen or refrigerated showcase.

1 Open Showcase 2 Winding Roll 3 Night Cover 4 Multifilament with Long Yarn Length 5 Multifilament with Short Yarn Length

Claims (6)

  A night cover made of a fabric, wherein the fabric is made of a plain woven fabric, and the warp or weft constituting the plain woven fabric is made of a mixed yarn composed of a hollow cross-section multifilament and a multi-leaf cross-section multifilament. Features a night cover for a frozen or refrigerated showcase.   The night cover for a frozen or refrigerated showcase according to claim 1, wherein the multi-leaf cross-section multifilament and the hollow cross-section multifilament have a thread difference.   The night cover for a frozen or refrigerated showcase according to claim 2, wherein the multifilament multifilament yarn length is longer than the hollow cross-section multifilament yarn length.   The night cover for a frozen or refrigerated showcase according to claim 2 or 3, wherein a difference in thread length between the hollow cross-section multifilament and the multi-leaf cross-section multifilament is 6 to 12%.   The night cover for a frozen or refrigerated showcase according to any one of claims 1 to 4, wherein the hollow section multifilament has a hollow ratio of 30 to 50%.   The ratio (L / D) of the number of leaves of the multileaf multifilament is 3 to 8 and the depth D of the concave portion of the two leaves with respect to the tangential length L in contact with the convex portion of the two leaves is 25% or more. A night cover for a frozen or refrigerated showcase according to any one of the above.

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