JPS5917651B2 - Manufacturing method of currency geometric pattern plastic sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the production of a patterned plastic sheet, and more specifically to a method of producing a plastic sheet having the same geometric pattern running through it on both sides.

The conventional manufacturing method for patterned plastic sheets is as follows:
There are extrusion methods, calender roll methods, and press methods. In particular, in the geometric pattern sheet manufacturing method, a layer of fine particles of the resin composition is deposited on a continuous belt conveyor, and the fine particles are heated to partially melt each particle. This is deposited or sintered to form a porous aggregate to produce a temporary molded body, and a printing composition is applied to the surface of this molded body in a desired geometric pattern using a printing device.

Thereafter, this printed porous molded body is passed through a press machine and compressed into a uniform non-porous sheet by applying heat and pressure (hereinafter referred to as the sintering method), which has been relatively superior for many years. known as the method. There is also a method (hereinafter referred to as the plate method) in which a desired pattern is assembled on a support using a plate mold or the like, and granules of each color are cast simultaneously according to the plate pattern to form a patterned sheet. However, since the above-mentioned sintering method uses a printing device, only a fine particle composition or a paste-like composition can be used, and a thick geometric pattern penetrating the front and back surfaces cannot be obtained.

Another method is to infiltrate a sintered porous aggregate with a coating mixed with microparticles or a foaming agent, but this method also creates a geometric pattern that completely penetrates the front and back surfaces with the same resin composition. It's difficult. In addition, in the plate method: 1-, the border lines of the pattern tend to collapse, making it difficult to obtain a clear geometric pattern.

Furthermore, there is a drawback that non-uniformity in thickness tends to occur. Accordingly, the present invention relates to the production of a plastic sheet with a geometric pattern extending through the front and back surfaces.According to the present invention, the drawbacks mentioned in the conventional sintering method and plate molding method are solved, and furthermore, the product is improved. The present invention relates to a novel method for producing plastic sheet with a through-geometric pattern that provides long-term preservation of the original shape of the patterned parts and economical use of pattern making equipment.

Regarding the production of a plastic sheet with a geometric pattern penetrating both the front and back sides, the present inventors previously applied for patent application No. 49-14915.
In No. 4, a manufacturing method far superior to conventional methods was disclosed.

That is, according to this manufacturing method, plastic granules are first supplied onto one pattern frame type screen, and a plastic granule guiding member, a base member (moving belt) and a base member (moving belt) which protrude below the screen along the pattern frame type are provided. The granules are supplied and filled into the space formed by the screen using a spatula. This pattern frame screen is then removed, and the granular material forming part of the resulting geometric pattern is moved by movement of the base member to the bottom of the next pattern frame screen, where it is formed. The next empty space is filled with other plastic particles. The base member is further moved, and the space formed under the next frame-shaped screen is similarly filled with the next plastic granule.
Similar operations are repeated until a preformed integral sheet with the desired final geometric pattern is obtained. Therefore, the number of pattern frame type screens required corresponds to the number of unit patterns constituting the final geometric pattern. The thickness of the temporary molded body formed in this manner is adjusted by the height of the particulate guide member provided along the pattern frame mold joined to the screen. In other words, by using a pattern frame mold to which a particulate guide member having a height corresponding to the desired thickness of the temporary formed body is joined, a geometric pattern of the desired thickness can penetrate through the front and back sides and be integrated. A preform from which a worn plastic sheet can be obtained is produced. Next, the patterned temporary molded body is sent into a heating furnace by moving the base member, heated and sintered while being freely exposed to the surrounding atmosphere to form an adhesive sheet, and then formed into a adhesive sheet that conforms to the desired geometric pattern. A continuous long band of a plastic sheet with a penetrating geometric pattern is formed through processing, pot sinking, annealing, and cooling processes using an embossing roll or an embossing press with a mold surface. The plastic sheet with the through-geometry pattern produced in this way retains its original pattern over time even if wear occurs. The present invention is based on the above-mentioned invention, and has been developed by researching an industrial manufacturing method for faithfully reproducing the boundaries of each partial pattern of a sheet with a geometric pattern that runs through the front and back from the original drawing to obtain a more clear geometric pattern that runs through the front and back. I was able to complete it. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a sheet with a geometric pattern extending through the front and back sides, which has a more vivid pattern than conventional sheets.

A further object of the present invention is to provide a method of manufacturing a sheet with a geometric pattern extending through the front and back sides having complicated pattern boundaries and having an excellent production capacity.

Still another object of the present invention is to provide a method for manufacturing a sheet with a geometric pattern that runs through the front and back sides, in which the thickness of each partial pattern can be arbitrarily changed.

Another object of the present invention is to provide an apparatus for carrying out the method for manufacturing the above-mentioned sheet with a geometric pattern passing through both sides.

The object of the present invention is to supply plastic granules onto a design belt from each rotary screen to form a temporary molded body corresponding to each pattern part, and to transfer the temporary molded body formed on the design belt by a reversing roller. A method for producing a plastic sheet with a penetrating geometric pattern, which comprises the steps of transferring the plastic sheet onto a conveyor belt, and sequentially heating and sintering, embossing, annealing, and winding the temporary formed body on the conveyor belt, and a circularly movable design belt having guide members arranged corresponding to the geometric patterns on its surface; a rotary screen having a number of plastic granule supply screen openings corresponding to the geometric patterns; and a number of rotary screens corresponding to the number of patterns. This is achieved by an apparatus for producing a plastic sheet with a penetrating geometric pattern, which consists of a conveyor belt that receives the preform formed on the design belt via a reversing roller and transports it to a heating furnace.

In the above manufacturing apparatus, the design belt is equipped with a pin hole that engages with a pin of a reversing roller that rotates in synchronization with the drive roller, and the rotary screen is equipped with a squeegee for feeding plastic particles onto the design belt from the screen opening. is built-in.

The outline of the method of the present invention will be explained below with reference to the drawings.

In FIG. 1, on a circulating design belt 5 whose surface is provided with guide members 18, 19, 20, 21 arranged corresponding to a desired geometric pattern, a rotary wheel synchronously aligned with each of the guide members is mounted. As the rotary screen rotates, plastic particles 26/, 2 are removed from the patterned openings 30, 31, 32, 33 of the screens 1, 2, 3, 4.
7', 28', 29 course {squeegee 26, 27, 28,
The material is supplied to corresponding portions of each guide member while being leveled by the guide member 29, thereby forming temporary molded bodies 26'', 27'', 28'', and 29''.

Next, the temporary formed body on the design belt 5 is transferred onto the conveyor belt 9 by a reversing roller 7 so as not to lose its shape, and moves together with the design belt 5, but it separates from the design belt 5 at the position of the release roll 8. After being carried into the heating furnace 13 and sintered, and passing through the embossing roll 14,
It is wound up as a long sheet 16.

The invention will be explained in more detail by the following examples.

EXAMPLE A dry blend having the following composition was extruded and ground using a shear grinder to produce a granular composition that passed through a 15-mesh sieve.

To 100 parts of the above granular composition, 20 parts of paste resin (for example, 6 Zeon 135J: 200 mesh, manufactured by Nippon Zeon Co., Ltd.), 15 parts of plasticizer, and 0.5 part of stabilizer are mixed. By combining the granular composition and the paste resin, a granular powder-free mixture is produced in which the granular composition and paste resin are uniformly distributed throughout, and the fine particles can flow more or less freely around the particles of the composition as cores.

The above formulation example shows an example of raw materials for carrying out the production method of the present invention, and additives may be used as long as they are not blended with granular powder that has properties suitable for carrying out the present invention. , the amount added can be changed appropriately. Furthermore, there are no particular limitations on the size and shape of the individual particles of the granules used in the present invention, and they may have any size and shape as long as they can pass through the mesh-like screen portion of the rotary screen. . In addition to vinyl chloride resin, raw material resins for the granular composition used in the present invention include vinyl resins such as vinyl acetate and vinyl fluoride polymers, or mixtures thereof, and other copolymerizable monomers. Copolymers of , polyethylene, polypropylene, butadiene-styrene copolymers, etc. are suitable.

Further, pigments of colors corresponding to the respective pattern portions are added to prepare a granular powder-free material containing the same number of pigments as the number of colors of the patterns constituting one unit pattern sheet. Four pigment formulations were prepared in this example. Next, the manufacturing process of the present invention will be explained with reference to the drawings.

The above-mentioned four types of unblended granular powder are charged into the respective rotary starlines 1, 2, 3, and 4 using a screw conveyor or a tube conveyor.

Each of the rotary screens 1, 2, 3, and 4 is provided with screen openings 30, 31, 32, and 33 each having a shape corresponding to the corresponding pattern portion, as shown in a developed view in FIG. In addition, squeegees 26, 27, 28, and 29 are built into the rotary screen, respectively, and the unmixed granular powder 26', 21', 28', and 295 are squeezed into the rotary screen of the thin metal or plastic cover 25. The gap between the tip of the squeegee installed on the inside and the squeegee 1 (approximately 10 m) and the design belt 5 made of soft plastic or rubber (for example, neoprene)
6″, 21″, 28″.Feed evenly like 290 (
Figure 7). It is preferable that the squeegee be slightly inclined from the vertical direction to the direction of rotation of the rotary screen. A force bar 25 provided inside the rotary screen cooperates with a squeegee 1 to uniformly and smoothly feed granules from the screen opening into a designed belt shape. In this way, the guide members of each partial pattern on the design belt 5 are filled with the unblended granular powder in the order of the rotary screens 1, 2, 3, 4, and the temporary formed bodies 26'', 2r, 28'' , 29'' are formed. The design belt 5 is supported by a support hole 6. As shown in FIG. The pin 22 of the reversing roller 7 is engaged with the hole to rotate the design belt.

The temporary formed bodies 26'', 21/', 28'', and 29'' are placed on the conveyor belt 9 fed out from the drive roller 11 by a reversing roller r.
is transferred to the heating furnace. The conveyor belt is made of polytetrafluoroethylene reinforced with glass fibers and can be used for a sufficiently long period of time even with the heat in the heating furnace. The temporary formed body on the conveyor belt 9 that has reached the separation roll 8 is transferred to the design belt 5 and the guide members 18, 19.
, 20, 21 (FIG. 6), and enters the heating furnace 13 (ambient temperature 200'C) together with the conveyor belt 9 to be heated and sintered. 10 is a tension roll for maintaining the tension of the conveyor belt 9.

The sintered and integrated sheet has an embossing roll 1 installed facing a rubber backup roll 15.
Add an embossing that matches the pattern using 4 (roll pressure 2)
~10kg/CriLl7'C). The embossed sheet passes through an annealing step 24, is air cooled, and is wound into a continuous long strip sheet product 16. The rotary screen can be manufactured by a conventional method in textile printing technology, for example, by electroforming to create a shielding part other than the pattern (a part through which the unmixed granular powder does not pass) and a mesh-like screen part of the pattern part.

Others, for example. It can also be manufactured by the corrosion method, in which the screen portion is corroded into a mesh shape, or the lacquer method, in which patterned portions are created using a photocurable photosensitizer.
The guide member provided on the design belt is integrally molded with the belt portion at the same time when the design belt is molded. The height of this guide member can be appropriately selected depending on the thickness required for the final sheet with a penetrating geometric pattern, but in this example, the height is 2.5 m/
The height of the guide member is 4.0 m to obtain m sheet products.
/m. In addition, the guide member has a wedge-shaped cross section with an acute angle (α) so that it can be easily separated from the temporary molded body by the release roller 8 and the temporary formed body does not collapse during separation, but this angle α is 0.
~4'' is appropriate (Figure 6). According to the present invention, a thicker sheet product can be obtained compared to the conventional method, and the thickness of the sheet product according to the present invention is 1 to 5 m77! or more.

The thickness of the temporary molded body depends on the apparent specific gravity of the temporary molded body, but is generally about 150% of the thickness of the final product sheet. In the above embodiments, there are four types of colors of the pattern; red pigments such as molybdenum, red red pigment, and parallax; yellow pigments such as zinc yellow, zinc chromate, and benzidine yellow; and blue pigments such as cobalt blue, ultramarine, and For example, chromium oxide green is used as the green pigment, but even more diverse patterns can be created by providing rotary screens corresponding to the number of desired colors.

In addition, since the plastic sheet with the penetrating geometric pattern of the present invention is formed from granular materials, it is possible to combine the colors of the granular materials in a complex manner within one design that forms part of the pattern. You can create sheets with rich patterns.

According to the present invention, after completing one unit pattern of the temporary formed body made of plastic granules, the guide member is removed for the first time at the position of the release roll, so that the temporary formed body does not collapse and the boundary line is extremely sharp. A sheet with a penetrating geometric pattern is obtained.

In addition, since the temporary formed body does not collapse in this way, the cross-sectional angle α of the guide member can be made extremely small. By using a guide member with a small thickness (that is, a small width), it is possible to obtain a pattern with border lines that are faithful to the original drawing. Furthermore, in the apparatus of the present invention, the guide member is provided directly on the design belt, and the vertical relationship between the guide member at the granular material supply position and the temporary formed body formed therein is the same as that of the earlier patent application (Japanese Patent Application No. 11491
54) is the opposite.

Therefore, when the size of the particulate feed screen opening is kept the same, the pattern width on the surface side of the sheet product according to the present invention can be made smaller than that of the sheet product according to the prior invention, and is even thinner. You can create a width pattern. In addition, in the device of the present invention, since no guide member is provided on the screen side, the production of the screen is significantly easier than in the case of the prior application. By partially building up the top surface of the design belt according to the present invention, it is possible to locally change the height from the tip of the guide member to the surface of the design belt, thereby giving an embossed pattern effect to the surface of the product sheet.

Furthermore, the back side of the design belt can be lined with a suitable reinforcing material, such as fabric, to extend its service life. When the device of the present invention is operated, the rotation of the rotor I no screen and the operation of the design belt are completely synchronized, and the screen opening of the rotary screen and the corresponding pattern on the design belt are perfectly aligned. to meet.

By operating these continuously, extremely high productivity can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a diagrammatically illustrated apparatus for carrying out an embodiment of the invention, and FIG.
It is a plan view of the part seen from the A-A direction, and FIG.
FIG. 4 is a cross-sectional view taken along line B-B in the figure, and FIG.
5 is a developed view of the rotary screens 1, 2, 3, and 4 shown in FIG. 1, and FIG. 6 is an enlarged sectional view showing the state near the release roll 8. FIG. 7 is an enlarged sectional view of the vicinity of the rotary screen 1.

Claims (1)

[Claims] 1. A method for manufacturing a plastic sheet by forming a sheet-like temporary molded body using plastic granules as a raw material and heating and sintering the plastic granules, in which the plastic granules are supplied from each rotary screen onto a design belt. a step of forming a temporary molded body according to each pattern portion, a step of transferring the temporary formed body formed on the design belt onto a conveying belt by a reversing roller, and a step of sequentially transferring the temporary formed body on the conveying belt. A method for producing a plastic sheet with a penetrating geometric pattern, comprising sending it to a heating sintering process. 2. A circularly moving design belt with guide members arranged corresponding to the desired geometric patterns on its surface, and a number of rotary rotors having plastic granule supply screen openings in shapes corresponding to each geometric pattern and corresponding to the number of patterns. screen,
and a conveyor belt that receives the temporary formed body formed on the design belt via a reversal roller and transports it to the heating furnace, and the design belt is provided with a pin hole that engages with a pin of the reversal roller that rotates in synchronization with a drive roller. An apparatus for manufacturing a plastic sheet with a penetrating geometric pattern, characterized in that the rotary screen is equipped with a squeegee inside the rotary screen for feeding plastic particles onto the design belt through the screen openings.