JPS63283778A - Flocking method for thermoplastic resin sheet - Google Patents

Abstract

PURPOSE:To simplify manufacturing conditions without using adhesives by letting short fibers fly and sticking them into sheet surface by means of electrostatic sucking force while a sheet, rolled or extruded, is still in a thermally softened state by the heat of processing. CONSTITUTION:Thermoplastic resin melted in an extruder is continuously extruded in a state of sheet from a sheet die 1 to form a sheet 2, which is then formed between a plurality of rolls 3 into a sheet having a predetermined thickness and sent out at a constant speed. In succession, while the sheet 2 is still in a thermally softened state, flocking is performed on the lower surface of the sheet 2 by letting short fibers fly and sticking them into said surface with a flocking apparatus 5 comprising a high voltage electrode 6 and a grounded electrode 8. The flocked sheet 20 is stretched and suspended by rolls 11, 12 to be transferred and cooled to a room temperature by a cooling apparatus 16 while the sheet 20 being sucked by an endless belt 13 such as a wire gauze circulating at a speed conforming with the extrusion speed of the sheet 2.

Description

[Detailed Description of the Invention] "On-vehicle Ω ■ Menstrual Blood 1" This invention is a method for transplanting hair onto a thermoplastic synthetic resin sheet by electrostatic attraction without using an adhesive to fix the short fibers. in between.

The method of flocking a long synthetic resin sheet is to cool the rolled or extruded sheet, wind it up into a roll, and then unwind the rolled sheet again and glue it to the surface of the sheet. After applying an adhesive, short fibers are flocked to the adhesive layer.
Subsequently, the adhesive layer was dried and solidified by heating, and further cooled to obtain a flocked product.

Four beaks.

In the conventional method of flocking synthetic resin sheets using electrostatic attraction, it is essential to apply an adhesive to the surface of the sheet to form an adhesive layer. The adhesive used at this time has a thick adhesive layer in order to firmly anchor the short lai fibers to the adhesive layer. For this reason, adhesives for flocking require stricter selection than general adhesives, such as the type of resin that makes up the solid content, the reaction mode, the type and amount of filler added, and the drying rate of the solvent or dispersion medium. Furthermore, since the coating equipment and drying equipment have a high viscosity and require a large amount of coating, various highly accurate working conditions are required.

, ' or '9 The method of flocking the thermoplastic synthetic resin sheet of this invention is as follows:
A thermoplastic synthetic resin is continuously rolled or extruded from a molten state into a sheet, and then, while the sheet is still in a heat-softened state, short fibers that can be heat-sealed to the sheet are statically applied to the surface of the sheet. The hair is transplanted using electric suction power, and no adhesive is used.

In addition, in order to carry out this method more effectively, after flocking the bottom surface of the sheet using electrostatic attraction, the top surface of the sheet is vacuum-fed to a permeable endless belt that rotates in synchronization with the rolling or extrusion speed of the sheet. It is best to cool the sheet while adsorbing it.

1-1 month The method for flocking a thermoplastic synthetic resin sheet of this invention is as follows:
With the above structure, the sheet that is rolled or extruded can be rolled or extruded without applying an adhesive to the surface of the thermoplastic resin sheet.
While the sheet is still in a thermally softened state, short fibers are caused to fly onto the surface of the sheet using electrostatic attraction, and then enter the sheet, and the heat possessed by the sheet fuses the short fibers to the sheet. It is. Therefore, not only can the conventional problems related to the types of adhesives, coating equipment, and drying equipment for using adhesives be solved, but also the manufacturing conditions are simplified and the process is continuous with the rolling or extrusion process. It is extremely economical and efficient because it can be carried out in multiple steps.

As described above, according to the method of flocking a thermoplastic synthetic resin sheet of the present invention, the upper surface of the thermoplastic synthetic resin sheet,
It is possible to flock the flock by electrostatic attraction without using adhesive on the bottom or top and bottom surfaces, but in particular, after flying the short fibers upward from the bottom and planting the flock on the bottom of the sheet, the top surface of the sheet is If the sheet is cooled while being vacuum-adsorbed by an air-permeable endless belt that rotates in synchronization with the rolling or extrusion speed, it is easy to deal with excess short mIt and prevent short fibers from scattering.

Examples of the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a sectional view illustrating an apparatus for carrying out a first embodiment of the present invention.

The thermoplastic synthetic resin melted in the extruder is continuously extruded into a sheet from a sheet die 1, and this sheet 2 is formed to a predetermined thickness between multiple sets of rolls 3.3, and is then extruded at a constant speed. Sent out. Subsequently, short fibers 4 are flocked onto the lower surface of the sheet 2 while the sheet 2 is still in a heat-softened state.

The flocking device 5 consists of a high-voltage electrode 6 and a grounding electrode 8. The high-voltage pole 6 also serves as a tray for storing the short edges 1!4 that fly for flocking, and the short fibers 4 are transported by a screw conveyor 7 to The liquid is supplied from the same direction and is evenly distributed to each part of the plate while being agitated by the flights of the screw conveyor 7. The short fibers 4 on the tray of the high voltage electrode 6 fly toward the upper ground electrode 8 as high voltage is applied, pass through the ground electrode 8, and pierce the sheet 2 due to its acceleration. At this time, as well as stirring by the flights of the screw conveyor 7, the high-pressure electrode 6
Applying an appropriate wind force upward from the bottom of the dish from the floor etc. will help the short fibers 4 to fly uniformly at each part.In addition, a cover 9 is provided around the outer periphery of the flocking device 5 to prevent the short edges VA4 from scattering. It is being

The high-voltage electrode 6 is connected to an electrostatic high-voltage generator (not shown) with a maximum output of 100 KV DC, which measures the short fiber length, the humidity in the flocking chamber 5, the distance between the high-voltage electrode 6 and the ground electrode 8, etc. The appropriate voltage is applied via a transformer (not shown) which can be adjusted accordingly.

The upper surface of the sheet 20, on which the single fibers 4 are flocked, is suspended under tension by rolls 11 and 12, and is made of a breathable endless material such as wire mesh or woven fabric that rotates in synchronization with the extrusion speed of the sheet 2. It is attracted by the belt 13 and runs. A box 14 is provided between the rolls 11 and 12, and the air inside the box 14 is evacuated by a vacuum pump (not shown), so that the inside of the box 14 is at a pressure of 0.5 to 0.8 atm. The bottom surface of the box body 14 that makes up the decompression chamber 15 and is in contact with the endless belt 13 is in the shape of a lattice 19, forming ventilation holes and allowing the flocked sheet 20 to enter the inside of the box body 14 via the belt 13. It prevents you from being drawn in.

During this time, the flocked sheet 20 is cooled down to room temperature by the cooling device 16 by means of cold air jetting, cold water spraying, etc. from the bottom side, and is taken up between two sets of rolls 17 and 18, and is either wound up or immediately placed in a predetermined position. Cut to shape.

Thermoplastic resins used in this invention include Bolier,
Examples include tyrene, polypropylene, polyamide, polyacrylonitrile, polyester, ethylene-vinyl acetate copolymer resin, vinyl chloride resin, thermoplastic elastomer, etc., and are rolled into sheets using extruders, kneading rolls, and calenders. The resin is supplied to the flocking device 5 in a molten state at a temperature of 130 to 230"C, although the resin temperature varies depending on the type and brand of the resin.

The short fibers 4 to be flocked include single fibers spun from the same resin as the material of the sheet 2, single fibers spun from a resin compatible with the material resin of the sheet 2, and a mixture of these single fibers. Thickness: 0°5 to 50 denier, length: 1
．． The material used is one cut into 5 to 15 mm pieces and coated with an electrodeposition treatment agent consisting of inorganic salts, various surfactants, organic silicon, etc.

In this embodiment, the short III fibers 4 fly from below the sheet 2 and effectively enter the surface of the sheet 20 due to electrostatic attraction, so that the flocking density can be uniform and the short fibers are not scattered upward. Since the particles are blocked by the sheet 2, the scattering range is narrow, and measures to prevent scattering can be easily taken.

(Second Embodiment) FIG. 2 is a sectional view illustrating an apparatus for carrying out a second embodiment of the present invention.

The thermoplastic synthetic resin melted in the extruder is continuously extruded into a sheet form from a sheet die 1, and this sheet 2 is formed to a predetermined thickness between multiple sets of rolls 3.3, and is then extruded at a constant speed. It is delivered, placed on an endless belt 23 suspended under tension by rolls 21 and 22, which rotates in synchronization with the delivery speed, and introduced into a flocking chamber 24.

The flocking chamber 24 includes a hopper 25 for short fibers 4, a high voltage electrode 26, a ground electrode 27, and the like. The hopper 25 is configured to vibrate vertically and horizontally, and drops the short fibers 4 uniformly within the electric field. When a high voltage is applied to the high voltage pole 26 provided under the hopper 25, the short fibers are
is charged with a high voltage, an electric field is formed between the high-voltage electrode 26 and the ground electrode 27, and the short fibers 4 fly toward the ground electrode 27 and pierce the upper surface of the sheet 2, which is still in a thermally softened state. The short liaison burst into it due to the heat of 4
The tip of the hair is melted and attached to the hair. Note that in this method,
In particular, if the short fibers 4 fall unevenly into the electric field, the flocked state of the product will be poor.

The flocked sheet 40 is subsequently cooled by the cooling device 17 on the end level belt 23. After the sheet 2 portion is sufficiently cooled and the short fibers 4 are fixed to the sheet 2, the flocked sheet 40 is introduced into a recovery device 29 for the remaining short fibers 4 without being fixed, and is shown as a rotating brush 30. The remaining short fibers are collected by the exhaust system that is not installed.

The flocked sheet 40 then leaves the endless belt 23 and is drawn between the rolls 17, 18 and either wound up into a roll or immediately cut into a predetermined shape.

In the above two embodiments, the method of flocking to either the upper surface or the lower surface of the sheet 2 has been described, but it is also possible to combine these methods to implant flocks to both sides of the sheet 20.

Main sail Ω effect In this invention, the sheet is rolled or extruded without applying adhesive to the surface of the thermoplastic resin sheet, and the sheet is still in a thermally softened state due to the heat during the rolling or extrusion process. During this process, the short fibers are caused to fly onto the surface of the sheet by electrostatic attraction and enter the sheet, and the short fibers that have entered the sheet are fused to the sheet by the heat possessed by the sheet.

Therefore, since no adhesive is used, the manufacturing conditions are simplified, and the process can be carried out continuously with the rolling or extrusion process, making it extremely economical and efficient.

According to the method of this invention, it is possible to implant flocks by electrostatic attraction without using an adhesive on the upper surface, lower surface, or upper and lower surfaces of a thermoplastic synthetic resin sheet. In the method of Example 1, the sheet is cooled while the upper surface of the sheet is vacuum-adsorbed by an air-permeable endless belt that rotates in synchronization with the rolling or extrusion speed of the sheet, after the flocking is carried out on the lower surface of the sheet. Since only the short fibers with a tinge of color fly upwards, the short fibers can surely and effectively rush into the sheet. Compared to the method of Example 2, the amount of residual short fibers is small, so it is difficult to deal with the short fibers or remove the short fibers. Since upward scattering is blocked by the sheet, the scattering range is narrow and it is easy to take measures to prevent scattering.

[Brief explanation of the drawing]

FIG. 1 is a sectional view illustrating an example of an apparatus for carrying out the invention, and FIG. 2 is a sectional view illustrating another embodiment of the apparatus.

Claims (1)

[Scope of Claims] 1 Short fibers that can be continuously rolled or extruded into a sheet from a molten state and then heat-sealed to the sheet while the sheet is still in a heat-softened state. A method of flocking hair onto a thermoplastic synthetic resin sheet using electrostatic attraction on the surface of the sheet. 2. After flocking to the bottom surface of the sheet using electrostatic suction force, the sheet is cooled while the top surface of the sheet is vacuum-adsorbed by a breathable endless belt that rotates in synchronization with the rolling or extrusion speed of the sheet. A method for flocking a thermoplastic synthetic resin sheet according to claim 1.