JPS6227950B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a nonwoven abrasive material.

Conventional non-woven fabrics are produced by forming a base material in which fibers are assembled three-dimensionally without any direction into a pine-like shape of a desired thickness.
It was manufactured by applying adhesive from both sides and bonding the intersections of the fibers. To use this nonwoven fabric as an abrasive material, an adhesive mixed with abrasive grains was applied to the surface, or an adhesive was applied to the surface and the abrasive grains were attached to it before it hardened. However, since the abrasives manufactured by this method are formed into a pine shape and then coated with adhesive from the surface, the density of the adhesive inevitably decreases from the surface toward the inside, causing the fibers inside the nonwoven fabric to become thinner. The intersection points were not completely bonded, which did not guarantee sufficient strength, and the fibers had the disadvantage of separating into pieces during use. In particular, the softer the non-woven fabric is, in which the fine fibers are densely assembled, the more difficult it is for the adhesive to penetrate into the fabric, resulting in a significant drop in durability. To increase the bond strength of the fibers, it is better to increase the amount of adhesive applied. However, as the amount of adhesive applied increases, the flexibility and elasticity of the adhesive decreases, and the original, or rather the most important feature of this type of abrasive is lost. It had some flaws. Furthermore, since the abrasive force of the nonwoven fabric abrasive material is greater at the end face than at the surface, in a preferred state of use, a cut surface cut at right angles to the laminated surface, not the surface, is used. This is because the fibers are not completely oriented and combined to form a nonwoven fabric, and most of the fibers are gathered parallel to the surface of the nonwoven fabric, so the cut ends of the fibers are exposed at the cut end. It is.

Therefore, for example, when manufacturing a roll-shaped abrasive material, a mat-shaped nonwoven fabric is punched out into a disc shape, a plurality of discs are stacked, and they are glued together so that the cut surface of the nonwoven fabric appears on the circumferential surface of the roll. do. However, in the abrasive roll formed in this state, the adhesive is not evenly applied to the surface and inside of the nonwoven fabric, so the surface of the roll has unevenness in hardness and abrasive force in the axial direction. There was a drawback that caused this.

In addition, in the manufacturing process of nonwoven fabrics, conventional nonwoven fabrics are made by stacking the base material into a mat shape to the desired thickness and then applying an adhesive to the surface, so it is difficult to maintain the fabric in the mat shape. There is almost no shape,
There was a drawback that transportation in this state was difficult.
Abrasive materials made of nonwoven fabric and having an adhesive evenly applied to the inside are known. This abrasive material is made by first forming it into a mat shape, then applying adhesive on both sides to produce a non-woven fabric, then dipping it in the adhesive, or applying a large amount of adhesive and sandwiching it between rolls. The adhesive is squeezed out and applied to the entire surface of the fiber. However, in abrasives manufactured by this method, the entire surface of the fibers is coated with adhesive, so the fibers are many times thicker, and the surface adhesive The elasticity and flexibility characteristic of the material were lost, and the abrasive material became so-called hard and lacking in flexibility. In other words, nonwoven fabrics manufactured by conventional methods are flexible and elastic, but the interior is not sufficiently bonded and is not durable, and nonwoven fabrics that are strongly bonded to the inside are hard and inflexible. There were flaws.

A method of manufacturing an abrasive roll was developed by dipping a pine-like nonwoven fabric in an adhesive solution and then winding it up (Japanese Patent Application Laid-Open No. 1983-93989). Because the entire surface is coated with adhesive, it is not possible to produce a flexible and highly elastic abrasive material.Also, due to the structure in which the nonwoven fabric is passed through the adhesive, at least the thickness of the nonwoven fabric is such that the nonwoven fabric is transported with some tension on rolls. Therefore, extremely thin non-woven fabric cannot be used as a raw material, and in order to apply adhesive to the inside, it is necessary to completely immerse it in adhesive liquid.
It is not possible to apply small amounts of adhesive to the fiber surface.

In order to eliminate these drawbacks, the present invention applies an adhesive between the outer fabrics during the fabrication process.An important objective of the present invention is to achieve uniform hardness and abrasiveness on the cut surface of the nonwoven fabric. An object of the present invention is to provide a method for producing an abrasive material made of nonwoven fabric, which has the following features and is entirely flexible and highly elastic.

Another important object of the present invention is that the abrasive material made of strong non-woven fabric can be easily manufactured, that the substrate can be bonded to the material at the same time as it is formed into a mat shape, and that handling such as transportation of the abrasive material after it is formed is easy. An object of the present invention is to provide a simple nonwoven fabric for an abrasive material and a method for producing the same.

Embodiments of the present invention will be described below based on the drawings.

The nonwoven fabric for abrasive material shown in Figure 1 is nylon,
A plurality of substrates 1, which are synthetic fibers such as vinylon and tetoron, or natural fibers such as hemp and cypress, are assembled in a three-dimensional manner without directionality, are stacked to form a pine-like shape with a desired thickness, and adhesive is attached between the substrates. An adhesive is applied and the intersections of the fibers are bonded by this adhesive.

When attaching abrasive grains to the surface of fibers using an adhesive, the abrasive grains are sprayed onto the surface of the substrate coated with the adhesive immediately after the adhesive is applied, or
It is best to mix abrasive particles into the adhesive and spray this onto the surface of the substrate.

The method of applying adhesive between the substrates as they are laid up is shown in FIGS. 2 and 3. In Figures 2 and 4, the fibers have no three-dimensional direction, for example, the thickness is 1 to 8 mm, and the width is 50 cm to 2 mm.
A substrate 1 formed in the shape of a strip of m is folded on both sides of the belt 2 by a substrate delivery member 3 that reciprocates in the lateral direction of the belt 2 on a belt 2 which is a table moving in a fixed direction. The folds are formed on both sides of the belt, facing in the longitudinal direction of the belt, and are formed into a mat shape with a desired thickness.

Nozzles 4a and 4b for spraying adhesive and abrasive grains onto the upper surface of the substrate are disposed on both sides of the delivery member 3, and these nozzles 4a and 4b reciprocate together with the delivery member 3, and The blowing state is controlled in synchronization with the movement. That is, in FIG. 2, when the delivery member 3 moves to the right, the left nozzle 4
When only the nozzle a sprays adhesive and abrasive grains onto the substrate and the delivery member 3 is driven to the left, the right nozzle 4
Only b blows out adhesive and abrasive grains. That is, in any state, the delivery member 3 reciprocates.
Only the rear nozzle sprays adhesive and abrasive particles onto the substrate. The adhesive is blown out from the nozzle in the form of a mist along with the air, and the air and the adhesive blown out from the nozzle are used to attach the material folded onto the belt.
The material is pressed gently onto the belt without any force, thereby gathering and bonding the material to a certain density. If the air blowing pressure is too strong, it will blow away the assembled fibers and disturb the aggregated state, so the wind speed is determined so that the aggregated state of the fibers is not disturbed in any case.

Preferably, one of the nozzles always blows out the adhesive and applies the adhesive to the entire surface of the substrate 1 to be folded. However, depending on the usage condition of the nonwoven fabric, it may not be necessary to apply adhesive to the entire surface of the folded material, and if the fibers of the nonwoven fabric are thick and loosely gathered, the adhesive may smoothly penetrate inside. Therefore, it is not necessary to apply adhesive between all the substrates; for example, adhesive may be applied to every other substrate or every second substrate.

In FIGS. 2 and 3, the thickness of the nonwoven fabric in which the substrate 1 is formed into a mat shape can be adjusted by changing the moving speed of the belt. That is, when the belt speed is increased, the nonwoven fabric becomes thinner, and when the belt speed is slowed down, the nonwoven fabric becomes thicker. Generally, the number of laminated layers of the base material is 5 to 20 layers with a nonwoven fabric having a thickness of 5 to 20 mm.

The method for producing a nonwoven fabric of the present invention configured as described above prepares a substrate formed in a band shape within a certain area so that the folds thereof are located on both sides of a belt moving in a certain direction and face the longitudinal direction of the belt. Then, they are sequentially placed horizontally on the belt and stacked in a folded state, and during the stacking process, a mist of adhesive is applied to the top surface of the substrate placed on the belt, and abrasive grains are also supplied. Then, by repeating the process of depositing a base material on top of this, and then spraying adhesive and abrasive material thereon, and moving the belt in a certain direction at a given speed, a non-woven abrasive material is made. Because it manufactures a belt, a fairly thin base material can be deposited on the belt, and the atomized adhesive and abrasive material can effectively penetrate between the fibers of the base material. The adhesive and abrasive grains that are sprayed from above the base material pass through the fibers of the upper base material, penetrate into the lower base material and adhere to it, and the adhesive and abrasive grains are sprayed uniformly over the entire fiber. applied. Furthermore, by simply changing the conveyance speed of the belt, the thickness of the nonwoven fabric with abrasive grains and adhesive evenly adhered to the inside can be adjusted, and the thickness can be freely adjusted even for fairly thick abrasive materials. It has the effect of being easy to manufacture.

Furthermore, a noteworthy feature of the present invention is that when the belt is folded and stacked, a mist of adhesive is applied from the top surface and abrasive grains are supplied. The rolled base material is pressed onto the base material below without any force, the fibers of the upper and lower base materials are more effectively combined into a tangled state, the uneven boundaries that tend to occur between the base materials are minimized, and all fibers can be bonded with less adhesive. The reason is that it can be completely combined. This feature, combined with the above-mentioned effects, makes it possible to produce an ideal non-woven abrasive material that is flexible and has fibers uniformly and firmly bonded to the inside. be.

Furthermore, the adhesive penetrates evenly into the interior, completely bonding the intersections of the fibers, increasing the bonding strength of the fibers, that is, the strength of the nonwoven fabric, and significantly extending its durability as an abrasive.

Strength can be increased by uniformly applying the adhesive to the inside, which means that there is no need to apply a large amount of adhesive to the surface, there is no hardening caused by the adhesive, and the inherent flexibility of non-woven abrasives is maintained. and elasticity are not lost. Furthermore, the entire cut surface has uniform hardness and abrasive power, so even if you punch it out into a disk shape and roll it up, the roll of abrasive material will have uniform hardness and abrasive power all around. It has a strong abrasive power, and the surface of the object to be polished is polished evenly and without any unevenness.Furthermore, a single sheet of abrasive material can be cut into a desired shape, and can be used, for example, to wash dishes in the kitchen. When used, unlike conventional abrasives, the fibers do not unravel and the overall shape is not separated into pieces, and the durability is significantly extended. Furthermore, in the manufacturing process, the substrates are bonded at the same time as they are laminated, so the fibers of the laminated nonwoven fabric are already bonded and held in a mat shape of a predetermined thickness, and the shape may change depending on the subsequent handling. It has the characteristics that it does not crumble and can be handled very easily after layering.

In addition, since the adhesive used to bond the substrate is also used to bond the abrasive grains, both the fibers and the abrasive grains are bonded together with a single layer of adhesive, making the abrasive material strong and highly abrasive with less adhesive. It becomes possible to manufacture non-woven fabrics for use.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a nonwoven fabric showing an embodiment of the present invention, and FIGS. 2 and 3 are a front view and a side view of a nonwoven fabric manufacturing apparatus used in the present invention. 1...Material, 2...Belt, 3...Delivery member, 4...Nozzle.

Claims (1)

[Claims] 1. A base material formed into a belt shape of a constant width is sequentially laid on a belt so that its folds are located on both sides of the belt moving in a constant direction and face the longitudinal direction of the belt. During the stacking process, a mist of adhesive is applied to the upper surface of the substrate placed on the belt, and abrasive grains are supplied, so that the adhesive and abrasive grains are A belt-like material is folded and stacked on top of the coated material, and the process of spraying atomized adhesive and abrasive grains on top of this and folding the material on top is repeated, and the belt is rotated at a predetermined speed. A method of manufacturing a nonwoven abrasive material having a predetermined thickness by transporting it in a fixed direction. 2. The method for producing a nonwoven fabric abrasive according to claim 1, which comprises mixing abrasive grains with an adhesive and applying the adhesive to the surface of the substrate.