JPS59106595A - Papermaking needle felt and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved needle felt for FC papermaking and a manufacturing method thereof. Needle felt for papermaking is made by bonding TAI fibers to a base fabric with a relatively coarse weave, and its papermaking properties include good air permeability, water resistance, surface smoothness, non-shedding properties, and elasticity. , dimensional stability, tension resistance, abrasion resistance, etc., and in recent years, as paper machines have become faster and larger, further improvements in these properties have been required. Ta. In order to cope with this, needle felt, which was traditionally made mainly of wool, is now made of synthetic resin filaments, synthetic fibers alone, or spun yarns with a large amount of synthetic fibers mixed as the base fabric, and the batting is also made of synthetic fibers alone or synthetic fibers. People began to use materials with a large amount of blended fibers.

Needle felt uses a needle to pierce the fibers of the batt into the base fabric and combine them, as well as intertwining the fibers of the batt with each other, so even wool with good entanglement properties tends to shed hair, but the more synthetic fibers there are, the more hair loss occurs. In order to prevent this, needling and tightening are strengthened, which reduces hair loss and increases surface smoothness and compressive elasticity, but it also increases air permeability. The problem could not be solved satisfactorily because the reactor water quality deteriorated and the reactor was shattered. In addition, since the fibers of the batt are inserted perpendicularly and randomly into the base fabric, the height of the standing fibers varies, and the surface of the felt is relatively uneven, causing wrinkles and moisture spots on the paper. Defects may occur, and even the use of hair burning or shearing as a preventive measure has not been a sufficient solution. The present invention improves such conventional drawbacks, and relates to a needle felt that has less hair loss, a smooth surface, and other paper-making performance equivalent to or better than conventional products, and a method for producing the same, and in particular, it is made with fibers on one or both sides of the base fabric. A papermaking needle in which the base fabric, the batts, and the fibers of the batts are partially adhered to each other by a solidified product after melting and cooling of a small piece of a synthetic resin film for thermal bonding in a needle felt made by laminating batts and bonding them by needling. In a needle felt manufacturing method, a base fabric is passed through a felt and needle machine, and needling is performed while supplying a fiber batt onto the base fabric,
Before and after supplying the bat, one or more synthetic resin films for thermal bonding are supplied and needling is performed many times,
The synthetic resin film for heat bonding is made into small pieces, the fibers constituting the base fabric and the batt are entangled with each other, and then heated by a heating device to melt and solidify the small pieces of the synthetic resin film for heat bonding, and The present invention relates to a method for manufacturing needle felt for paper making, in which a base fabric, a batt, and fibers of the batt are partially bonded to each other using a coagulated product, and will be described below with reference to the drawings.

The papermaking needle felt 1 of the present invention is relatively coarse, using synthetic resin filaments or synthetic fibers alone, spun yarns mixed with natural fibers, or a combination of these! ! A batt 3 made of synthetic fibers and/or natural fibers is bonded to one or both sides of the base fabric 2 by needling, and the fibers of the batt are intertwined with each other. Small pieces of synthetic resin film 6 for thermal bonding are melted at the points of contact between the direction yarns and weft yarns 5 (cross paper machine direction yarns) and the inserted fibers of the batt, and at the intersections of the fibers of the batt, and then cooled by air cooling or the like. The coagulated material 7 adheres and partially adheres the two, making the fibers less likely to fall off than felt, and the surface is smooth, and finishing treatments such as resin treatment are applied as necessary. Synthetic resins for the filaments used as yarn include polyamide, polyester, polyacrylonitrile, and polypropylene, and the synthetic fibers that make up the spun yarn include polyamide, polyester, polyacrylonitrile, polypropylene, and polypropylene. Vinylidene chloride type, polyurethane type, etc., and natural fibers include wool, cotton, and hemp. Base fabric 2
After weaving these threads singly or in an appropriate combination into an endless form or an endless form using a conventional method, the two ends are spliced together,
It is endless. It is important that the structure, smoothness, etc. of this joint part remain the same as other parts.

In general, it is preferable to use relatively strong and thin threads for the warp and relatively elastic and thick threads for the weft.

The synthetic resin film 6 for thermal adhesion is made of polyamide, polypropylene, polyethylene, etc., and has a melting point lower than general synthetic fibers and natural fibers, and has a temperature of 60 to 130°C and a thickness of 30°C.
~150μ is used. The synthetic resin film for thermal adhesion is one or more sheets arranged between the base fabric and the batt, and between each layer of the batt, which is made into small pieces by repeated needling and dispersed throughout the felt, and then melted by heating. It is then cooled and solidified by air cooling, etc., and the coagulated material 7 adheres to the contact points of the threads of the base fabric and the fibers of the batt and the intersections of the fibers of the batt, forming an aggregate in which the fibers of the batt are tightened. It has a felt shape that is resistant to crushing even when subjected to strong pressure from various machine rolls, and has a smooth surface. Examples of resins used for resin processing applied to felt as needed include melamine resin, formaldehyde resin, epoxy resin, phenol resin, and urethane resin.

The papermaking needle felt of the present invention can be manufactured using a conventional needle machine equipped with a heat-adhesive synthetic resin film supply device 8 and a heating device 9, or alternatively, instead of this heating device, two cylinders 10 are installed as separate devices facing each other. This is carried out using a dryer of the same type as above with a heating device 11 attached. A needle board 13 is passed over an endless base cloth with the upper part loosely horizontal and the lower part slack, and the batt 3 sent by the lattice 12 is fed onto the needle board 13 while rotating slowly. Needling with. The batt is supplied in 1 to 10 layers. During this time, a synthetic resin film 6 for thermal bonding is suitably fed between the base fabric and the batt, or between the layers of the batt, from the feeding device 8. If you want to put a piece of paper on the back side as well, just turn the felt over and do the same operation. This needling alone may be sufficient, but in order to improve the entanglement of the fibers, it is preferable to carry out needling the required number of times without supplying the bat and the synthetic resin film for thermal bonding. By repeated needling, the heat-adhesive synthetic resin film becomes small pieces and is dispersed throughout the felt. Next, the needling is stopped and the heating device 9 is activated to increase the temperature from 70 to 160°C to 3 to 1 at a temperature higher than the melting point of the synthetic resin film for thermal bonding and lower than the melting point of general synthetic MI# or natural fiber.
Either heat it 0 times or change it to a dryer with cylinders 10 facing each other, and heat it to 70 to 160'C with heating machine 11 while keeping it in a tense state to melt the small pieces of the synthetic resin film for thermal bonding. The coagulated material 7 formed by cooling is used to bond all the contact points between the threads of the base fabric and the fibers of the batt, as well as the points of intersection between the fibers of the batt. At this time, if a small piece of the synthetic resin film for thermal bonding is melted and then pressed with a press roll 14, the adhesion will be better. If finishing processing such as resin treatment is required, it is then applied by conventional methods.

As described above, in the papermaking needle felt of the present invention, the batt is bonded to the base fabric by needling, and the points of contact between the threads of the base fabric and the fibers of the batt and the points of intersection between the fibers of the batt are bonded to the synthetic resin film for thermal bonding. Since the structure is made by adhering small pieces with solidified matter produced by cooling after melting, there is little hair loss, and the surface is smooth and does not collapse even under strong pressure, retaining voids, so it has good mark prevention and pick-up properties. It has excellent air permeability, reactor water resistance, abrasion resistance, etc., and its manufacturing method is simple, as it only involves adding a heat-adhesive film and a heating operation during normal manufacturing.

Example An endless base fabric was woven using a 1600 denier polyester monofilament as the warp and a No. 4 spun yarn made of a mixture of nylon fiber and wool as the weft, and the base fabric was hung on the needle machine described above. 5 layers of batts made of nylon fibers are supplied from the lattice onto this while rotating slowly, and between the first and second layers and between the third and fourth layers.
Needling was carried out while supplying a thermal adhesive nylon film having a melting point of 100° C. and a thickness of 50 μm between the layers. Next, the felt was turned over, and needling was performed while supplying the above-mentioned nylon film for thermal bonding and bat in that order. Next, without supplying the batt and the nylon film for thermal bonding, needling is performed two times from the back side and five times from the front side to bond the batt to the base fabric, and entangle the fibers of the batt with each other, while also needling the nylon film for thermal bonding. into small pieces. Next, the felt was placed in a dryer with two cylinders facing each other, heated to 140"C to melt the small pieces of the nylon film for thermal bonding, and then cooled in air. A needle felt for paper making of the present invention was obtained by bonding the contact points of the yarn and batt fibers and the intersection points of the bat fibers with a coagulated product of nylon film for adhesive.
After 0 hours, there were only 5 hairs attached to the paper and no marks, and the moisture content of the paper was 58%, whereas conventional needle felting had 30 hairs attached and a few marks. , the moisture content was significantly higher than that of 60%.

[Brief explanation of drawings]

FIG. 1 is a partial vertical cross-sectional view taken along the warp of the needle felt for papermaking of the present invention, FIG. 2 is a side view of a needle machine for manufacturing the same, and FIG. 6 is a side view of a dryer for manufacturing it. In the figure 118. Needle felt for paper making, 2...
・Base fabric, 3. ... Batt, 4... Warp, 5... Weft, 6... Synthetic resin film for thermal bonding 7. Coagulated small pieces of synthetic resin film for thermal bonding, 8... Synthetic for thermal bonding Resin film supply device, 900. heating device, 10
．． , Cylinder, 11, Heating machine, 12...-Lattice, 13--Needle board, 14--Press roll.

Claims (2)

[Claims] (1) In needle felt in which fiber batts are laminated on one or both sides of a base fabric and bonded by needling,
A needle felt for paper making, characterized in that the base fabric, the batt, and the fibers of the batt are partially adhered to each other by a solidified product after melting and cooling a small piece of a synthetic resin film for thermal bonding. (2) In a needle felt production method in which a base fabric is passed through a needle machine and needled while supplying a fiber batt onto the base fabric, a synthetic resin film for thermal bonding is applied before and after supplying the batt. One or more sheets are supplied and needling is performed many times to form the synthetic resin film for thermal bonding into small pieces, and the fibers constituting the base fabric and batt are entangled with each other, and then heated with a heating device to form the A method for manufacturing needle felt for paper making, which comprises melting and then solidifying small pieces of a synthetic resin film for thermal bonding, and using the resulting solidified material to partially adhere the base fabric, the batt, and the fibers of the batt to each other.