JPH05111914A - Plastic coloring method - Google Patents

Abstract

PURPOSE:To prepare plastic of optional color tone by controlling the feeding speed of said device by means of a control device in the feeding device for feeding a plastic raw material into a plasticizing device for plastic. CONSTITUTION:A feeding device 105 for feeding a bar or plate-shaped colored strand 101 containing a coloring agent of high concentration and a feeding device 106 for feeding a colorless bar or plate-shaped colorless strand 102 are provided in a supersonic energy plasticizing device. The feeding speed of respective feeding devices 105 and 106 is controlled by a control device 120. Plastic of optional tone can be prepared by varying the speed of feeding a raw material from the feeding devices 105 and 106 to a plasticizing device 111.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic coloring method applicable to a plasticizing device such as an injection molding machine, extrusion molding, blow molding, or a polymer alloying device.

[0002]

2. Description of the Related Art A conventional plastic coloring method is shown in FIGS.
Will be described. FIG. 2 illustrates a method of spreading a colorant on a colorless pellet. In the figure, 201 is a colorless pellet, 202 is a colorant, 203 is a container for the colorless pellet 201, 204 is a container for the colorant 202, and 205 is a container. Mixing container,
Reference numeral 206 is a lid of the mixing container 205, 207 is a screw for fixing the lid 206 to the mixing container 205, 208 is a rotating roller, and 209 is a rotating roller driving device. Here, the operation of spreading the colorant on the surface of the colorless pellets using the above apparatus will be described. After the colorless pellets 201 and the colorant 202 are charged into the mixing container 205 at a constant ratio, the mixing container 205
The lid 206 is fixed to the plate with screws 207. The mixing container 205 is set on the rotating roller 208, and the driving device 20
If the rotating roller 208 is rotated at 9, the mixing container 205
Rotates, and the colorant 2 is applied to the surface of the colorless pellet 201 inside.
02 is evenly spread.

Next, the plasticizing process of the pellets on which the colorant has been spread as described above will be described with reference to FIG. In FIG. 3, 301 is the spread pellets described in FIG.
02 is a hopper, 303 is a screw, 304 is a reducer and a motor, 305 is the same mixing container as 205 of FIG. 2, 31
2 is a cylinder, 314 is a heater, 315 is a cylinder, 3
Reference numeral 12 is a base for fixing the speed reducer and the motor 304.
Next, the plasticizing process by the above apparatus will be described. The spread pellets 301 are transferred to the cylinder 3 through the hopper 302.
12 and the screw 303 is rotated by the speed reducer and the motor 304 at the same time. Due to the rotation of the screw 303, the pellet 301 generates shearing heat between the screw 303 and the cylinder 312 while being transported leftward in FIG. The pellet 301 is plasticized and melted by the heat generated at this time and the heat of the heater 314 transmitted through the cylinder 312. The plasticized and melted pellets are completely mixed with the colorant and solidified through an injection molding die or an extrusion die (not shown) to give a colored plastic molded product.

Another plastic coloring method is shown in FIGS.
A rod-shaped colored plastic is molded by the method described in 1. and cut into master pellets. Next, the master pellets are treated in exactly the same manner as the colorant 202 described in FIG. 2 to color the plastic.

[0005]

By the way, when the plastic is colored using the master pellets, it is necessary to mix the master pellets and the colorless pellets well in order to prevent color unevenness. Therefore, as shown in FIG. The mixing process is an unavoidable process. On the other hand, in order to achieve a desired color with plastic by mixing, it is necessary to determine the mixing ratio of the master pellet and the colorless pellet according to the color. However, it was difficult to determine this ratio, and therefore, the steps of mixing and plasticizing and melting had to be repeated many times in order to achieve the desired color. Also, when changing the color tone during molding, it is necessary to completely discharge the previous mixed pellets from the cylinder to supply pellets with a new mixing ratio, which is a problem that these operations are very complicated. It was

Therefore, the present invention is a device for plasticizing a plastic raw material with ultrasonic energy, which feeds a rod-shaped or plate-shaped plastic raw material containing a coloring agent having a high concentration and a colorless rod-shaped or plate-shaped plastic raw material. By providing a set of feeding devices and controlling the feeding ratio of the raw material containing the colorant and the colorless raw material by the control device, it is possible to obtain plastic of any color tone (color density), It is intended to solve the above problems.

[0007]

Therefore, according to the present invention, a rod-shaped or plate-shaped plastic is fed and plasticized in the gap between the ultrasonic horn and the anvil which are directly opposed to each other or the gap between the ultrasonic horn which is directly opposed to each other. The ultrasonic plasticizing device includes a plurality of plastic feeding devices and a control device for arbitrarily setting the feeding speed ratio of the plastic feeding devices. Plastics having different colors or different color densities are controlled by the plastic feeding device by the control device. The mixing ratio can be arbitrarily set, and this is used as a means for solving the problem.

[0008]

[Function] Two sets of feeding devices for feeding a rod-shaped or plate-shaped plastic raw material containing a high-concentration colorant and a colorless rod-shaped or plate-shaped plastic raw material are provided, and a raw material containing a colorant and a colorless raw material are fed. Construct plastics of any color with varying proportions.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plastic coloring method according to an embodiment of the present invention will be described below with reference to FIG. 1. In FIG. 1, a plastic raw material is fed to a gap between an ultrasonic horn and an anvil to plasticize it with ultrasonic energy. FIG. In FIG. 1, 101 is a colored strand that is a rod-shaped or plate-shaped plastic raw material containing a colorant, 102 is a colorless strand that is a rod-shaped or plate-shaped plastic raw material that does not contain a colorant, 103 is a reel of the colored strand 101, 104 is a reel of the colorless strands 102, 105 is a feeder for colored strands, 106 is a feeder for colorless strands, 107 is a guide for colored strands, 1
Reference numeral 08 is a guide for a colorless strand, both of which are set so as to guide the strand into a gap between a horn and an anvil described below. Further, 109 is an ultrasonic oscillator driven by a high frequency power source (not shown), 110 is a horn,
111 is an anvil, 112 is a cylinder, 113 is a static mixer, 114 is a heater, 115 is a base, 116
Is a mounting screw, a support stand for the anvil 111 and the cylinder 112, 117 is a support stand for the feeding devices 105 and 106, 11
Reference numerals 8 and 119 denote support bases for the reels 103 and 104, respectively.
120 is a control device for the feeding devices 105 and 106, 121,
Reference numeral 122 is a control cable connecting the control device 120 and the feeding devices 121 and 122.

Next, the operation of the embodiment configured as described above will be described. The colored strand 101 wound on the reel 103 is guided by the feeding device 105 to the guide 107.
It is sent into the gap between the horn 110 and the anvil 111 via. The colorless strand 102 is also fed from the feeding device 106 to the same horn 110 and anvil 1 in the same manner.
It is sent into the gap of 11. At this time, the feeding device 10
5, 106, the feeding speed is controlled by the control device 120 according to the desired color tone. The two kinds of strands sent together are plasticized and melted by the ultrasonic energy transmitted from the horn 110 (see Nikkan Kogyo Shimbun's ultrasonic technology flight supervisor, heat generation by ultrasonic waves).
And sequentially flows into the cylinder 112. The cylinder 112 is maintained at an appropriate temperature equal to or higher than the plasticizing temperature by the heater 114, and the inflowing molten plastic moves leftward in the cylinder 112 without solidifying. The molten plastic is agitated by the static mixer (spiral blade) 113 when moving, becomes molten plastic having a uniform color tone, and is delivered from the outlet 130. The feeding force of the molten resin is obtained by the feeding force of the strand. Although the process after the cylinder 112 is not shown, the molten plastic is molded into an injection molded product if it is injected into a mold through an accumulator, and into an extrusion molded product, a sheet or a film if it is extruded through a die. In addition,
Although the above examples show the case where the colored strands and the colorless strands are used, it is possible to mix a plurality of strands by adding different colored strands, or by adding a reel or a feeding device. Therefore, various color tones can be realized.

[0011]

As described above in detail, according to the present invention, since the control device 120 can set the feeding devices of the colored strands and the colorless strands of the feeding devices 105 and 106 separately, each of them can be set per unit time. Strand feed rate can be controlled. Therefore, the mixing ratio of the colored strands to the colorless strands can be arbitrarily set, and the color tone can be changed. Further, according to the method of the present invention, it is possible to control the feeding conditions while confirming the color tone of the molding result, so that it is possible to obtain the desired colored plastic molded product much more efficiently than the conventional coloring method. It has an excellent effect of.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of an ultrasonic energy type plasticizing device according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a conventional coloring process.

FIG. 3 is an explanatory view of a conventional plasticizing process.

[Explanation of symbols]

 101, 102 Strands 105, 106 Feeding device 110 Horn 111 Anvil 112 Cylinder 113 Static mixer

Claims (1)

[Claims] 1. An ultrasonic plasticizing device for feeding a rod-shaped or plate-shaped plastic into the gap between the facing ultrasonic horn and the anvil, or the gap between the facing ultrasonic horn to plasticize the plural plastics. Equipped with a feeding device and a control device for arbitrarily setting the feeding speed ratio of these, so that the mixing ratio of plastics having different colors or color densities can be arbitrarily set while controlling the plastic feeding speed by the control device. A method for coloring a plastic characterized by the above.