JPH0359140A - Material for molding steric structure and production of steric structure using the same - Google Patents

Abstract

PURPOSE:To obtain the subject material, having a specific dry heat shrinkage factor and opening angle and suitable for producing a steric structure such as bag or cover by blending conjugate filament yarn containing a low-melting point polyester as a sheath and partially fusing the sheath. CONSTITUTION:The objective material, obtained by producing sheath-core type conjugate filament yarn from (A) polyethylene terephthalate as a core component and (B) a low-melting polyester containing preferably 15-35mol% copolymerized isophthalic acid, etc., and regulated to 130-210 deg.C melting point as a sheath component at preferably (6:4)-(2:8) joining ratio of the components (A) to (B), mixing >=40wt.% resultant conjugate filament yarn, preparing a woven or knit fabric and heat-treating the obtained fabric at a temperature preferably >=10 deg.C higher than the melting point of the component (B) and lower than the melting point of the component (A) and providing <=5% dry heat shrinkage factor at 220 deg.C and <=60 deg. opening angle.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a material for three-dimensional structures such as boxes, bags, covers, ornaments, etc., and a method for manufacturing the three-dimensional structures using the same.

(Conventional technique #) Conventionally, paper and film sheets have been commonly used as materials for three-dimensional structures such as boxes and bags. Paper and film sheets have low air permeability (excellent sealing properties) and low dust generation. It is suitable for use as a material for three-dimensional structures because it has excellent foldability and shape retention when formed into three-dimensional structures. However, paper lacks shape retention, dimensional stability, and strength retention when wet with water, and film, which has the strength and thickness required for packaging, is hard and difficult to work with. There was a problem.

Furthermore, the means of aesthetic expression of paper and film is limited to printing, and it has been difficult to add various functionalities to them.

On the other hand, other materials include fibrous structures such as woven and knitted fabrics, but normal fibrous structures have poor bottom shape due to their drape properties, and also generate dust, making them unsuitable for these materials. It was appropriate.

As a fibrous structure having excellent bottom shape properties and dustproof properties, there is a method of mixing low melting point fibers as described in JP-A-59-59969.

(Problem to be solved by the invention!) However, as in JP-A No. 59-59969, fabrics that simply mix low melting point mm can be used as hard finishing fabrics, but they can be used for forming three-dimensional structures. This is because the dimensional stability during molding of the material is low, and the shape retention is not sufficient to support three-dimensional structures.

The present invention solves these drawbacks, and aims to provide a three-dimensional structure molding material made of a fiber structure having sufficient dimensional stability and shape retention, and to provide a material for molding a three-dimensional structure with a unique appearance and shape. An object of the present invention is to provide a method for producing a three-dimensional structure having the following properties.

(Means for Solving the Problems) The present invention has solved the above problems by using a core-sheath type composite filament yarn in which the core is made of polyethylene terephthalate and the sheath is made of low-melting point polyester.

That is, the material for forming a three-dimensional structure of the present invention is a woven or knitted fabric using at least 40% by weight of the above-mentioned core-sheath type composite filament yarn, in which at least a part of the intersection of the filament yarn is melted by melting the low-melting polyester. Furthermore, the dry heat shrinkage rate at 220° C. is 5% or less, and the opening angle according to the Monsanto method is 60 degrees or less.

Materials for molding such three-dimensional structures are heated at 200 to 230°C.
By molding and adhering under heat and pressure of 20 to 100 g/CIA'', a three-dimensional structure with excellent shape retention can be obtained.

The core-sheath type composite filament yarn used in the present invention has a core component made of polyethylene terephthalate and a sheath component made of a low-melting point polyester.
It is preferable to use a material having a melting point difference of 30°C or more between 0°C and The melting point of polyester is 130-210°C.

In addition, the core i11100 joining ratio of the core-sheath type composite filament yarn is preferably 6:4 to 2:8, particularly 5;
It is preferable that the sheath component is less than 40%, the adhesion when molding and bonding using this material may decrease, and if it exceeds 80%, the core component will decrease. Therefore, the strength of this material may decrease.

The single yarn fineness of the core-sheath type composite filament yarn is lO~30 deniers, and the number of filaments is about 10~30, which gives appropriate strength.
Preferable for obtaining moldability.

Further, it is necessary to use the composite filament yarn in its continuous form in order to maintain its strength and obtain dustproof properties.

The product of the present invention comprises such composite filament yarn of 40 weights/1
The material to be mixed with the filament yarn is not particularly limited, as long as it is a Va knitted fabric containing % or more of Va. A unique appearance can be obtained by mixing and weaving a polyester design yarn. Furthermore, in order to obtain a product with the best dimensional stability and shape retention, it is preferable to use the composite filament yarn close to the total amount of the woven or knitted fabric.

The texture and standard of the woven or knitted material can be selected depending on the purpose of the three-dimensional structure, but when used as a general box or bag, the cover factor [Annino
× number of holes per inch] in the longitudinal direction is 1500 to 25
The stitch density may be approximately 0.00 (in the case of &l fabric, the stitch density is comparable to this).

In the material for forming a three-dimensional structure of the present invention, as a result of heat-treating the woven or knitted fabric, at least a portion of the intersections of the composite filament yarns are fused by melting the low-melting polyester.

The heat treatment is preferably carried out at a temperature higher than the melting point of the low melting point component of the sheath of the composite filament yarn by 10°C or higher, more preferably 15°C or higher, and lower than the melting point of polyethylene terephthalate. Since shrinkage of the material occurs, it is preferable to heat the material in an expanded state to prevent wrinkles.

Furthermore, in order to avoid shrinkage occurring again due to the heat treatment during molding, it is recommended that the woven or knitted fabric be sufficiently shrunk by 15% or more, preferably 15 to 20%, during the heat treatment. Using a mold heat setter, a process such as negative width adjustment may be performed under overfeed.

Although the heat treatment may be carried out in any step such as scouring, setting, dyeing, finishing, etc., it is preferable to carry out the heat treatment in a subsequent step in consideration of the handleability of the woven or knitted fabric and the heating method described above.

The above materials have a dry heat shrinkage rate of 5% or less at 220°C.

Further, the opening angle according to the Monsanto method is 60 degrees or less.

When the opening angle exceeds 60 degrees, the shape retention of the crease (formability)
Two specimens with an opening angle of 1.5 x 4 cm according to the Monsanto method, which cannot be used as a molding material as in the present invention because of its poor properties, were taken in the longitudinal direction and tested using the JIS L-1096 wrinkle resistance B method (Monsanto method). ) is the average value of the results measured according to

Of course, this material may be subjected to various treatments such as dyeing, printing, flameproofing, stainproofing, water repellency, antibacterial, and moldproofing.

Next, a method for manufacturing a three-dimensional structure using this material will be described.

The three-dimensional structure referred to in the present invention is one having a three-dimensional structure, such as packaging materials such as boxes, bags, and book covers, and three-dimensional ornaments.

To obtain these three-dimensional structures, the material is bent to form a bottom shape, and the surfaces that come into contact as a result of the bending are glued together, but it is necessary to heat and press the bent and bonded parts during this process. The heating temperature is 200 to 230°C, which is about 0 to 20°C lower than the heating temperature at the time of manufacturing this material, and the pressure is 20 to 100 g/cm. Specifically, the bottom shape is adjusted to the above temperature. There is a method of pressing the bent portion to the above-mentioned pressure using a heated iron or the like, and then immediately shaping the bottom into a predetermined shape, and a method using an iron can also be used for the bonded portion.

By the method described above, the bonded portion exhibits an adhesive strength of 2 kg1c11 or more, and has sufficient strength to be used as a normal packaged product.

(Example) In the example, the adhesive strength was determined by measuring 2 vertically long test pieces with a value of 2 x 20.
The two sheets were stacked and a part of them was glued together at 220°C for 15 seconds in a dry heat sublimation fastness test 11 (Model TL-200 manufactured by Daiei Kagaku Seiki Seisakusho), and then in a Tensilon tensile tester. Measure the 180 degree peel strength and divide by the fabric width to obtain the adhesive strength (
g/cm).

Example 1 Isophthalic acid copolymerized polyester (isophthalic acid ratio: 20 mol%) was used for the sheath (melting point 185°C), and normal polyester (melting point 260°C) was used for the core, with a sheath-core bonding ratio of 1:1. A certain composite yarn (however, 250d/16
f, strength 4.8d, elongation 40%) and warp density 5
6 threads/inch, weft density 57 threads/inch, width 125c1
1 tack! ! ! woven. 2 in the warp direction of this tack
The dry heat shrinkage rate at 20°C was 20%. It was processed at 220° C. for 2 minutes using a pin tenter type heat setter to obtain a width of 100011 mm. The cantilever stiffness (JIS L 1096A) of this fabric was 191, and the Monsanto opening angle was 48 degrees. Next, a pressure of 25 g/3 was applied to the folded part of this fabric using an iron heated to 210°C. The product was heated and pressurized for 15 seconds, then immediately folded and cooled to form a box-shaped molded product, and the joint portion was similarly heated and pressurized to adhere. The resulting box had moderate hardness and firm creases. Further, the adhesive strength of the bonded portion was 3 g/c+s, which was sufficient strength.

Examples 2 to 3 Composites with different sheath-core bonding ratios using isophthalic acid copolymerized polyester (isophthalic acid ratio 20 mol%) in the sheath part (melting point 185 °C) and normal polyester (melting point 260 °C) in the core part A circular knit was knitted using yarn (250d/16f). The circular knit was cut open (width 23(2)) and treated at 220° C. for 2 minutes using a pin tenter type heat setter to obtain a width of 19.5 cm.

The Monsanto opening angle of these knitted fabrics and the adhesive strength when the knitted fabrics were made into a box in the same manner as in Example 1 were measured.

The results are shown in Table 1.

From this result, in Examples 2 to 3 according to the present invention, practical products with excellent moldability and strong adhesive strength can be obtained, but comparative examples in which the ratio of the fused portion is less than 40% are obtained. It can be seen that in No. 1, the Monsanto opening angle exceeds 60 degrees, the crease bottom shape is poor, and the adhesive strength is insufficient at 2 kg/cm or less.

Table 1 Examples 4 to 5 A circular knit similar to that in Example 2 was knitted by aligning the core-sheath type composite yarn used in Example 1 with ordinary yarns of different deniers and interlacing them. Cut open the circular knit (width 22cm) and process it at 220℃ for 2 minutes using a pin tenter type heat setter to make it width 1.
B. Finished to 5cm. Table 2 shows the results of measuring the Monsanto opening angle and adhesive strength of these structures.

From this result, practical products can be obtained in Examples 4 and 5 according to the present invention, but the ratio of the fused portion is 40%.
In Comparative Example 2 below, the opening angle of Monsanto exceeds 60 degrees, the self-folding property is poor, and the adhesive strength is less than 2 Kg/cs, indicating that the adhesiveness is insufficient.

Table 2 Example 6 A tack similar to Example 1 was woven, and a relaxer was used to weave 100
The material was scoured at a temperature of 120°C, contracted by 5% in both length and width, and then dyed with a disperse dye at 120°C using a tensionless high-pressure zinger, washed by reduction, and dyed red. The fabric shrunk by 10% in the length and 15% in the width compared to the gray fabric. Table 3 shows the color fastness of this product.

Table 3 also shows the color fastness of ordinary polyester tack for comparison, and it can be seen from these results that the products of the present invention have dyeing characteristics close to those of regular products.

Further, the product obtained in Example 6 was treated at 220°C for 2 minutes using a pin tenter type heat center to give an intensity of 100 (J
Finished in l. The cantilever bending strength of this structure is 19
cm, Monsanto opening/closing, angle 46 degrees, adhesive strength 3.
It was 舊/am on 2nd.

When a box was made using this structure in the same manner as in Example 1, the box had a fabric-like appearance and was a package with excellent fashionability.

Table 3 Example 7 The tack of Example 1 and @ was woven, a flower pattern was printed using an autoscreen printing machine (manufactured by -) Department), and a high-temperature steamer (manufactured by Ariori) was heated at 160°C for 15 minutes. After steaming, it was finished by cleaning with oven soap. The fabric shrunk by 14% both vertically and horizontally compared to the gray fabric. Further, using a pin tenter type heat setter, the material was treated at 220° C. for 2 minutes to obtain a width of 100 cm. The cantilever bending strength of this structure was 19 cm, the Monsanto opening angle was 46 degrees, and the adhesive strength was 3.2 Kg#n. A box was created in the same manner as in Example 1 using this structure. Featuring a fabric-like appearance,
The package is extremely fashionable.

(Effects of the Invention) The material for molding a three-dimensional structure of the present invention has excellent molding stability due to its shape retention properties at creases and low heat shrinkage, and allows a three-dimensional structure to be easily obtained. In addition, the method of the present invention enables efficient production of three-dimensional structures, and the three-dimensional structures obtained have unique appearance, texture, and softness that have never been seen before, and are extremely useful.

Claims (2)

[Claims] (1) A woven or knitted fabric using at least 40% by weight of a core-sheath type composite filament yarn whose core is polyethylene terephthalate and whose sheath is a low-melting polyester, and at least a part of the intersection of the filament yarns is a molten low-melting polyester. A material for molding a three-dimensional structure, which is fused by the method, has a dry heat shrinkage rate of 5% or less at 220°C, and has an opening angle of 60 degrees or less according to the Monsanto method. (2) The material for molding a three-dimensional structure according to claim 1 is
A method for manufacturing a three-dimensional structure, characterized by forming and bonding under heating and pressure at 230°C and 20 to 100 g/cm^2.