JPH0192464A - Base sheet for stencil paper and its production - Google Patents

Abstract

PURPOSE: To obtain a base sheet used for paper patterns, etc., having smooth surface, good dimensional stability, and good engravability by stepwisely calendering a fiber web containing plural kinds of binder fibers having different melting points each other to melt-fuse one kind of the binder fibers, while crystallizing the other. CONSTITUTION: This base sheet for paper patterns used for dyeing woven fabrics is obtained by calendering a fiber web comprising (C) ordinary polyester fibers and plural kinds of polyester binder fibers which comprise (A) non-drawn type polyester binder fibers and (B) thermoplastic polyester binder fibers having a melting point of 200-230 deg.C as follows, wherein the components A and B have different melting points, respectively. The fiber web is heated and pressed using a heated roll preliminarily heated at 130-200 deg.C, thus melting the component A to fuse the fibers constituting the web each other, and subsequently heated using a heated roll heated at 200-230 deg.C to melt and fuse the component B and simultaneously accelerate the crystallization of the component A.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a base sheet used as a printing pattern material, that is, a printing pattern material used when performing pattern dyeing such as Yuzen dyeing and Komon dyeing on textiles, etc. The present invention relates to a manufacturing method thereof.

[Conventional technology and its problems]

Traditionally, paper patterns for textile printing have been made from washi paper made from Kozo, Mitsumata, etc., coated with persimmon tannin several times and dried repeatedly. It requires a lot of labor and time and is expensive, and since persimmon tannin is a natural product, the production volume is limited and the quality is uneven.There are disadvantages such as insufficient supply and the tendency for incomplete products to be supplied. there were.

In recent years, paper patterns based on non-woven fabrics have been proposed as an alternative to the above-mentioned washed carpets, and have been put into practical use in some cases. There are problems such as the ability to cut out a desired shape with a chisel, strength in repeated use, stiffness, and resilience against fraying. Particularly when the pattern does not have sufficient stiffness, the pattern may shift or float due to the frictional force of the spatula or brush during the printing process, making it impossible to accurately print the pattern on the fabric. The present invention has been developed through intensive study and research in view of the current situation, and has not only excellent engraving properties and dimensional stability when wet, but also has particularly good stiffness and good dyeing workability. The present invention provides a nonwoven fabric for printing patterns.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention uses a so-called unstretched type fiber in which crystallization has not progressed and is obtained by omitting the stretching step in the polyester fiber manufacturing process. Binder fiber (hereinafter simply referred to as unstretched polyester) (first binder fiber) at 20 to 50 weight percent, 200 to 2
A fiber containing 3 to 10 weight percent of polyester thermoplastic binder fiber (second binder fiber II'') having a melting point of 30°C, and formed from a mixed fiber of two types of binder fibers with different melting points and ordinary polyester fiber. The above problems are solved by applying heat and pressure to the web.

The undrawn polyester fibers used as the first binder fibers used in the structure of the present invention are fibers in an amorphous state, in which only the drawing step is simply omitted from the manufacturing process of polyester fibers obtained by conventional methods, so they are heated from the outside. By accelerating crystallization by such methods, it becomes a normal polyester fiber with a melting point of 260°C, and again does not have melt adhesive properties at low temperatures. Therefore, a nonwoven fabric using the undrawn polyester fiber as the first binder fiber has better heat resistance and dimensional stability than a commercially available nonwoven fabric using a general binder fiber. However, if a fiber web containing normally undrawn polyester fibers is suddenly bonded at a high temperature of 200°C or higher, the melt viscosity will decrease;
The resulting non-woven fabric is very vapor-like and has no stiffness, and the surface and interior of the non-woven fabric undergoes significant film formation, making it undesirable as a printing pattern material.

In the present invention, in order to compensate for the processing disadvantages of the undrawn polyester used as the first binder fiber,
This problem was solved by mixing an appropriate amount of second binder fiber having a temperature of ~230°C. That is, two types of binder fibers are used, and in the first bonding process, unstretched polyester is melted and bonded at a relatively low temperature to obtain a bulky nonwoven fabric, and then the second bonding process is heated to 200 to 230°C. The second adhesion process promotes crystallization of unstretched polyester, adjusts thickness, improves surface smoothness, and dimensional stability, and has sufficient elasticity with an apparent density of 0.35~
0.55 g/e1 m'' base material sheet for textile printing patterns is provided.

The blending ratio of undrawn polyester fibers used as the first binder fibers is preferably 20t1% or more and less than 40% by weight.If it is less than 20% by weight, it is difficult to obtain a nonwoven fabric with sufficient stiffness, and dyeing workability may be affected. It becomes inferior in sex. Blend ratio of unstretched polyester is 40
If the weight percentage is exceeded, the surface smoothness will be poor, and partial film formation will easily proceed, resulting in a non-uniform paper pattern base sheet. On the other hand, the melting point of the other type of second binder fiber is preferably higher in order to promote crystallization of the undrawn polyester fiber and to improve heat resistance and dimensional stability, and a melting point of 200 to 230°C is preferable. i.e. 200℃
By performing the second stage of calendering at the above-mentioned high temperature, the crystallization of the undrawn polyester fibers is significantly promoted, and a nonwoven fabric for paper patterns with firm surface smoothness and excellent dimensional stability is obtained. .

The blending ratio of this second binder fiber is preferably 3 to 10% by weight; if it is less than 3%, it will be difficult to control the thickness and surface smoothness, and if it exceeds 10%, the dimensional stability and hot roll processability will be impaired. etc., and is less desirable.

〔Example〕

An embodiment of the present invention will be described in more detail below.

65 pieces of regular polyester fiber 0.8' x 38m
%, as the first binder 1ffi ilI unstretched type polyester fiber 5dX38 order 35%, melting point 2
Second binder fiber with core-sheath structure at 18°C 3' x 51m+
A mixed fiber web mixed with 5% of S and spread and laminated uniformly was heated to 170'C using a pair of heated rolls.
After hot press-bonding with a linear pressure of 15 kg/cm 2 , a pair of hot rolls heated to 220"C was used to heat-press it in the same way to create a smooth and uniform surface with a fabric weight of 100 g/a2 and a thickness of 0.20 mm. A paper pattern base sheet according to the present invention having a thickness was obtained.

Comparative Example 1 Normal polyester fiber 0.8d x 38 dragon 70
%, unstretched polyester fiber 5'd
A uniformly spread and laminated fiber web consisting of 30% of 38 fins was melt-pressed by a pair of heated rolls heated to 180°C at a linear pressure of 25 kg/cm to obtain a similar base sheet. .

Comparative Example 2 Ordinary polyester fiber 0.8d x 313 x 6o%
A uniformly opened and laminated fiber web consisting of 4 d x 51 mm 40% binder fibers having a core-sheath structure with a melting point of 150'C was heated to 150'C using a pair of heated rolls to apply a linear pressure of 25kg/ A similar base material sheet was prepared by heating, melting and pressing at a temperature of 1.

The results of bending resistance measurements of each of the above base sheets according to JISL10136 are shown in the table below.

The polyester base sheet for paper patterns obtained as described above is impregnated with a thermally crosslinkable resin mainly composed of acrylic ester-styrene copolymer resin, acrylic ester-vinyl acetate copolymer resin, etc., and then heated. The properties of the paper pattern base sheet obtained by curing are shown in the table below.

The strength of the waist was comprehensively evaluated from the deflection distance when a load was applied to the test piece.

Dimensional stability was determined by dimensional changes after immersion in water for 24 hours and then drying at 100'C for 10 minutes three times in succession.

Evaluation was made based on engraving performance, force running resistance of the cutter blade, occurrence of fuzz on the cut surface, etc.

〔Effect of the invention〕

In the present invention, since the base sheet is constructed using two types of binder fibers having different melting points and crystal structures as described above, the second binder fibers bond and fix the web constituent fibers to each other, and at the same time, A base material sheet that promotes the crystallization of the first binder fiber, exhibits strong elasticity, and has excellent properties such as dimensional stability and engraving properties due to the flat grooves on the surface, making it an ideal base material sheet for paper patterns. This invention has various effects such as making it possible to stably obtain the following.

Claims (2)

[Claims] (1) Contains 20 to 50 weight percent of unstretched polyester binder fibers (first binder fibers) and 3 to 10 weight percent of thermoplastic polyester binder fibers (second binder fibers) having a melting point of 200 to 230°C. A fiber web composed of a plurality of polyester binder fibers having different melting points and ordinary polyester fibers is formed by crystallizing the first binder fibers by heat-pressing and bonding the web-constituting fibers to each other with the second binder fibers. A base material sheet for paper patterns featuring the following. (2) Unstretched type polyester binder fiber (first
A fiber web composed of a plurality of polyester binder fibers with different melting points, including a thermoplastic polyester binder fiber (second binder fiber) having a melting point of 200 to 230°C, and ordinary polyester fiber is heated and pressurized. After the web constituent fibers are bonded together by melting the stretched polyester binder fibers, the second binder fibers are melted and bonded using a hot roll heated to 200 to 230°C, and at the same time, the crystallization of the first binder fibers is promoted. A method for producing a base material sheet for a paper pattern, characterized by subjecting it to calendering so as to produce a paper pattern base sheet.