JPH0284517A - Light shield fabric - Google Patents

Abstract

PURPOSE: To produce the subject fabric capable of being drape processed, dyed and printed by forming the fabric with plural core elements each having a light blocking material and plural sheath elements each having a whitening agent. CONSTITUTION: This white light-blocking fabric is made of a fiber comprising core elements containing a light-blocking material and sheath elements containing a whitening agent. The content of the light-blocking material is about 0.001-0.002 wt.% of the core elements and the content of the whitening agent is about 1.0-2.0 wt.% of the sheath elements. The core is sufficiently opaque, the sheath is sufficiently white and dulling of web after carding can be removed or reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to fabrics such as fabrics and fabrics, and more specifically to fabrics with high whiteness that block light rays and have drapability.
pery fabric).

(Description of the Prior Art) Opaque fabrics that do not allow light to pass through are
It is well known in the art that it is primarily used to block light from windows and make the room pitch black.

There are two ways to industrially produce such a blackout fabric.

The first method involves coating the back of the fabric with white acrylic foam to form a first coating layer, then forming a second coating layer of light-tight and opaque acrylic foam, and finally coating the fabric with white acrylic foam. The third coating layer is formed of acrylic foam. The second method involves layering thin white vinyl or polyester sheets to form a fabric, then layering a second thin vinyl or polyester sheet that does not allow light to pass through, and finally layering a third white vinyl or polyester sheet. A thin vinyl sheet or polyester sheet is further laminated.

However, light blocking fabrics produced by these methods suffer from a number of disadvantages. Specifically, this fabric has a large bulk and stiffness (st
if). Additionally, this light-blocking fabric has poor drapability and is difficult to wash. Also, such light blocking fabrics have a tendency to separate or peel. Furthermore, it is difficult to make it flame retardant. Furthermore, since it is difficult to sew, there is a problem in that the manufacturing cost becomes extremely high.

In order to overcome the aforementioned disadvantages, methods have been proposed for making light blocking fabrics from yarns having a black core covered with a white sheath component. However, because the core is black, the fabric has a black or gray appearance, making the fabric product aesthetically unsatisfactory. Techniques using a sheath and core are disclosed in U.S. Pat. No. 3,616,167 to Gosden, U.S. Pat. No. 3,700,544 to Matsui, U.S. Pat. No. 3,316,336, US Pat. No. 2,932,079 to Horn et al. and US Pat. No. 4,059,949 to Re. Disclosed in the issue.

For many fabrics, another desirable property is to reduce or prevent the generation of static electricity. For this reason, core and sheath fibers have also been made using core elements containing carbon black. This core element has the effect of discharging accumulated static electricity,
It is used practically in textile products such as carpets. However, in order for the fabricator to have certain electrical characteristics and be able to sufficiently discharge static electricity,
Requires large amounts of carbon black. Therefore, such fabrics also have the disadvantage of being too dark in color, making the final product aesthetically unsatisfactory. By blending fibers with the property of discharging static electricity with ordinary white fibers, blackness (blackness) is increased.
In this case, it is common practice to keep the content of static electricity-discharging fibers at 1% or less.

In order to solve the latter problem, various measures have been proposed to suppress the blackness of fibers. For example, proposals have been made to improve light refraction by making the core multifaceted.

This is discussed in U.S. Patent No. 396 issued to Matsui.
No. 8307 discloses a filament that mixes many elements, and has poor affinity.
Mixing more than one type of spinning materials to form a single filament into a nebular configuration
is formed. This patent uses polyester and polyamide fibers, and since polyester and polyamide have different refractive indexes, this property is used to make the filament itself impermeable to light. Since the filament has a nebular shape, the tip reflects irregularly and the filament loses its luster.

Alternatively, a whitening agent such as Tio2
It has also been done to add gents) to the sheath element.

However, in either case, the proportion of the sheath element in the final product must be greater than 50%, so the fineness must be dense (for example, 15 denier or more). This makes such fibers too stiff to be used in standard curtain fabrics or apparel products.

An example of such a core and sheath element is disclosed in U.S. Pat. No. 3,803,453 to Hull. This patent discloses that conductive carbon black is dispersed in a thermoplastic synthetic polymer, and the ratio of the sheath element to the cross-sectional area of the filament is 50% or more, thereby reducing static electricity between the core element and the sheath element. It is. Furthermore, Ti01 is used with a sheath element. It is stated that the filament fineness should be less than 50 denier, preferably less than 25 dpf. However, the denier of the smallest element among the embodiments disclosed in this patent is 1
7.2, and the denier is 110 in Table 3 of the patent.
．． It becomes 6. Therefore, as mentioned above, these fibers became too stiff to be used in standard curtain fabrics.

U.S. Patent No. 42162, granted to Naruth and others.
No. 64 also contains carbon black and T i O *
is used for the core and sheath elements. Therefore, the denier also becomes large. For example, 20 denier per 3 filaments.

U.S. Patent No. 35313, granted to Saiki Moto et al.
Example 2 of No. 68 has an intrinsic viscosity of 0.68 and 0.68, respectively.
50, two polyethylene terephthalates are used. By using these as polymers, very fine filament parts are formed, and the first polyethylene terephthalate is composed of 0.05% TiOt and 0.05% TiOt.
Contains 55% carbon black. The second polyethylene tylphthalate is brilliance (brilli).
ancy) is large. The yarn consists of 16 filaments, each filament being 3.0 denier. Polyethylene terephthalate containing carbon black is
When the filaments are viewed in cross section, they are uniformly dispersed in polyethylene terephthalate, which has excellent brilliance. However, the filaments are dark black and have brilliance, which makes them unsuitable for producing white light-blocking fabrics.

Other documents, although less relevant to the present invention, include U.S. Pat.
No. 51,545, U.S. Patent No. 288 to Karl et al.
No. 0056 and U.S. Patent No. 3 to Jamieson
There is No. 249669. Among them, U.S. Patent No. 2880
No. 056 discloses synthetic elements with natural crimp properties.

Conventionally, composite fibers (bi-component
ibers), these fibers have the further disadvantage that, due to their blackness, they cannot be used alone for the production of fabrics. For this reason, to make fabrics from conventional composite fibers, the desired degree of whiteness (w
It is usually blended with other fibers to impart a sense of height.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a light blocking fabric that eliminates the above-mentioned problems.

Another object of the present invention is to provide a light blocking fabric made from a composite of core and sheath elements.

It is a further object of the present invention to provide a light-blocking fabric that does not transmit light.

It is a further object of the present invention to provide a light blocking fabric that is aesthetically pleasing.

It is a further object of the present invention to provide a fiber in which the core element is sufficiently dark to prevent the passage of light and the sheath element is sufficiently opaque to prevent further darkening of the core element.

It is a further object of the present invention to provide a light blocking fabric which is particularly useful for curtain linings, printed and plain drapes in hotels and Mosols, theater curtains, woven vertical blinds, non-woven vertical blinds, etc. .

It is a further object of the present invention to provide a light blocking fabric that is white in appearance rather than gray or black.

The present invention covers woven fabrics, knits, stitch bond processed products,
It is a further object to provide a light-blocking fiber that can be used in fabrics such as needlework, wet laid, dry laid, spun bonds, spun lace, etc.

It is a further object of the present invention to provide a soft light blocking fabricator.

It is a further object of the present invention to provide a light-blocking fabricator that is easy to drape.

It is a further object of the present invention to provide a light-blocking fabric that can be dyed and printed.

(Technical Means and Effects) The so-called white light-blocking fabric according to the present invention includes a plurality of core elements containing a light-blocking substance and substantially preventing light from passing through, and a plurality of sheath elements containing a whitening agent. It is formed by fibers composed of
The core element and sheath element are combined to form a fiber.

The so-called white light-blocking yarn according to the invention comprises a plurality of fibers, the fibers having a core element containing a light-blocking substance to substantially prevent the passage of light, the fibers containing a light-blocking substance; The amount is about 0.001- of the core element
It is 0.002% by weight. The fiber further includes a plurality of sheath elements containing a whitening agent, the content of which is about 180-2.0% by weight of the sheath elements.

For the above and other objects, features and advantages of the present invention,
It will become clear from the detailed description below.

The white light-blocking fabric according to the invention has completely opaque properties and is made from fibers consisting of a core element and a sheath element. The present invention
The technique utilizes a core element containing carbon black and/or a suitable light blocking material and a sheath element containing TiO3 and/or other suitable whitening agent.

The core and sheath elements desirably have a weight of about 3 denier and a staple length.
gths) are sized appropriately to the desired composite yarn size. Although it is desirable to use F, R, polyester elements, this is not critical to the invention. Other suitable chemistries may be used, such as standard polyesters, polyamides, and other suitable chemicals for spinning the core and sheath elements.

Minimize the carbon black content in the core element and T i O! in the sheath element. By maximizing the content of , it is possible to create white yarns that are completely opaque to light. In the present invention, when the weight ratio of the sheath and the core is 50:50, carbon black is used in an amount of about 0.001 to 0002% by weight based on the weight of the polyester of the sheath. About 1.0 to 2.0% by weight of T i O* is used.

These yarns can be obtained by several suitable methods. For example, such a white yarn that is completely opaque to light can be made by varying the compositional percentages of the core and sheath elements. Alternatively, the yarn can be made by varying the amount of carbon black in the core element and/or by varying the amount of T i Ot in the sheath element. Furthermore, the yarn can be created by maximizing crimp in the element and/or by changing the geometry of the core element to maximize light reflection and/or light diffusion. Can be done.

In either case, the crimp and finish of the element must be such that it can be carded into a web and cross-lapped, and/or carded into a silver and spun according to conventional yarn manufacturing methods. There must be.

Furthermore, since the core element is a lighter gray or brown color than black, the opacity of the sheath is less important. For example, assuming we are making an element equivalent to 9S cotton or 600 denier, the yarn itself can contain 200 filaments in a 3 denier element.

When comparing the present invention with a conventional fabricator, the difference is that in the conventional fabric, carbon black is used primarily for discharging static electricity and not for blocking light rays. For this fabric, the maximum amount of carbon black is used.

Therefore, the dark gray yarn is made from a 300 denier yarn with 20 strands consisting of 50% uncrimped core and 50% sheath elements, and the maximum amount of carbon black is used. However, due to the large amount of carbon black used, the fibers need to be blended with white fibers to increase the whiteness of the appearance.

Therefore, such fibers are primarily used in carpets. On the other hand, since the present invention consists of a core element and a sheath element, no blending step is required to produce the fabric.

Materials other than carbon black and/or T i O2 may also be used to make the core and sheath elements of the present invention. However, in the case of the present invention, the core must also be sufficiently opaque to prevent light from passing through the fabric, and the sheath must be sufficiently white to provide an aesthetic appearance to the product. Must-have.

Additionally, by using the core and sheath elements of the present invention, the inherent haze of carded webs can be eliminated or substantially reduced. Standard ratios of these core elements and sheath elements can be used.

EXAMPLES In order to provide a better understanding of the present invention, specific examples are shown below in which carbon black and Ties are used within the ranges described above.

The fabric is made from 80 ends of 300 denier processed polyester warped yarn and 50 picks of 20s cotton count yarn.

Both yarns are warp-woven with a core element and an opaque sheath element, so that
pre-shrinking, calendering, and fluid entangling (
hydraulically entangling)
Finished by at least one of the following methods.

The fabric is made of 20s cotton count yarn 60
Make from end and 50 picks of 20s cotton count yarn. Both yarns are warp sateen weaves of a core element and an opaque sheath element and are finished by at least one of the following methods: pre-shrinking, calendering, and fluid entangling.

X1■1 Fabric is made from 24 ends of 4S small count yarn and 22 picks of 4S small count yarn. Both yarns are warp sateen weaves of a core element and an opaque sheath element and are finished by at least one of the following methods: pre-shrinking, calendering, and fluid entangling.

Real J1 Hada A fabric is a calendered and fluid-entangled carded web that can be made from 5 ounces per square yard of carded web.

In other embodiments of the invention, titanium dioxide can be included in both the sheath and the core. Adding titanium dioxide to the fibers reduces the shine of the fibers, but creates friction on the spinning equipment.

Therefore, if the content exceeds a predetermined amount, the fiber becomes practically unusable, which is not desirable.

In embodiments of the invention, titanium dioxide is used in both the sheath and the core, with the amount used in the sheath being about 0-4% of the polyester weight of the sheath. The weight of carbon black in the core is o,oos~0°01%, and the weight of T i 02 in the core is about 5~10%. This eliminates the luster of the fibers and maximizes the spinnability and drapability of the yarn. The total ratio of titanium dioxide to carbon black in the sheath and core determines the whiteness of the fiber. Approximately 100 parts of titanium dioxide in the sheath and core to 1 part of carbon black in the core.
A proportion of 0 parts yields commercially acceptable fibers with adequate whiteness. The weight of such fibers is preferably 1.5 to 8 deniers.

Although complete coverage is provided by a woven structure, this woven structure can be made opaque by using the opaque core and sheath elements described above.

This can be done independently of the fiber type. Therefore, the present invention can be used for fabrics such as woven fabrics, knits, stitch bonded products, needlework products, wet lays, dry lays, spun bonds, and spun laces.

EFFECTS OF THE INVENTION The present invention provides a white light-blocking fabric made from a core element and a sheath element, which does not allow any light to pass through and is aesthetically pleasing. That is, the core element is sufficiently dark to prevent light from passing through the fabric, and the sheath element is sufficiently opaque to prevent further darkening of the core element.

The present invention is particularly suitable for curtain linings, printed and plain drapes for hotels and malls, theater curtains, woven vertical blinds, non-woven vertical blinds, etc. As such, light blocking fabrics are soft and easy to drape, and can also be dyed and printed onto the fabric.

Applicant Burschel Sternlieb Procedural amendment (voluntary) 1.Display of the incident 2. Name of the invention 3. Person who makes corrections Relationship to the case Patent applicant bar shell sternlieb Patent application Hei 1-212014 light blocking fabric 4, teenager Reason Man 5゜4-10-12 Nakamiya, Asahi-ku, Osaka 535 6゜ Target of correction Claims column of the specification Number of claims reduced by amendment 7. Contents of correction In the specification, the "Claims" have been amended as shown in the attached sheet.

Scope of Claims ■ A fiber formed by combining a plurality of core elements having a light-blocking material that substantially blocks the passage of light rays and a plurality of sheath elements having a whitening agent. Features light blocking fabric.

■ A plurality of core elements having a light-blocking substance that substantially blocks the passage of light rays and a plurality of sheath elements having a whitening agent are provided, and the light-blocking substance covers approximately 0.001 to 100% of the core element.
0.002% by weight, whitening agent approximately 1.0-2% by weight of sheath element
．． A light blocking fiber characterized by having a light blocking material of 0% by weight ■ A plurality of core elements having a light blocking substance and a whitening agent;
A light-blocking fiber characterized in that it consists essentially of a fiber formed by bonding a plurality of sheath elements having a whitening agent.■ The sheath element and the core element have a weight of about 3 denier. Fiber according to claim 1 or 2. The core element and sheath element are polyester or polyamide. Fiber according to claim 1 or 2. The light blocking substance is carbon black. The fiber according to any one of claims 1 to 3 (1) The whitening agent is Ties The fiber according to any one of claims 1 to 3 (2) The whitening agent in the core and the sheath; The ratio with the light blocking material in the core is 10
00:1 Fiber according to claim 3 (10) The weight of the sheath element and core element is 1.5 to 8 denier (10) In the core The fiber according to claim 3, wherein the weight of carbon black is o, oos~0.01% of the core weight, and the weight of TiO2 in the core is 5~10% of the core weight.

Claims (18)

[Claims] (1) A fiber is formed by combining a plurality of core elements having a light blocking substance that substantially blocks the passage of light rays and a plurality of sheath elements having a whitening agent to form a fiber. Light blocking fabric. 2. The fabric of claim 1, wherein the sheath element and core element weigh approximately 3 denier. (3) The fabric of claim 1, wherein the sheath element and core element are polyester or polyamide. (4) The fabric according to claim 1, wherein the light blocking material is carbon black. (5) The fabric according to claim 1, wherein the whitening agent is TiO_2. (6) A light blocking fabric comprising a plurality of core elements having a light blocking material that substantially blocks the passage of light rays and a plurality of sheath elements having a whitening agent combined to form a fiber; A light beam characterized in that the content of the light blocking substance is about 0.001 to 0.002% by weight of the core element, and the content of the whitening agent is about 1.0 to 2.0% of the sheath element. Blocking fabric. 7. The fabric of claim 6, wherein the sheath element and core element weigh approximately 3 denier. (8) The fabric of claim 6, wherein the sheath element and core element are polyester or polyamide. (9) The fabric according to claim 6, wherein the light blocking material is carbon black. (10) The whitening agent is TiO_2 Claim 6
Fabrics listed in section. (11) A light blocking fabric characterized in that it is composed of fibers formed by combining a plurality of core elements having a light blocking substance and a whitening agent and a plurality of sheath elements having a whitening agent to form a fiber. (12) The fabric according to claim 11, wherein the light blocking substance is carbon black. (13) The fabric according to claim 12, wherein the whitening agent in the core is titanium dioxide. (14) The fabric according to claim 13, wherein the whitening agent in the sheath is titanium dioxide. (15) The fabric of claim 11, wherein the ratio of whitening agent in the core and sheath to light blocking material in the core is 1000:1. (16) The fabric of claim 15, wherein the light blocking material is carbon black and the whitening agent in the sheath and core is titanium dioxide. (17) The fabric of claim 16, wherein the weight of the sheath element and core element is 1.5 to 8 denier. (18) The fabric according to claim 11, wherein the weight of carbon black in the core is 0.005 to 0.01% of the weight of the core, and the weight of TiO_2 in the air is 5 to 10% of the weight of the core. .