JPS5848327B2 - Method for manufacturing synthetic resin sheet with non-directional pattern - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a synthetic resin sheet 1 having a non-directional pattern such as a woodgrain pattern or a marble pattern. It is extremely useful for interior materials such as timber and flooring materials.

Conventionally, various attempts have been made to produce synthetic resin sheets having this type of non-directional pattern.

For example, in Japanese Patent Publication No. 49-35815, 1. 2. producing a synthetic resin sheet having a color or pattern; 2. crushing the sheet to create pieces of synthetic resin material colored in two or more colors; 3. Place the piece of synthetic resin material between two templates.
Arranged in a shape and heated and pressurized to form an integral sheet-like product,
4. A method for manufacturing synthetic resin tiles is disclosed in which the sheet-like material is cut along a plane substantially parallel to the wide surface of the sheet, and Japanese Patent Application Laid-Open No. 51-28156 discloses that: supplying two or more types of pellets; 2. 3. Vibrate the net-like conveyor to fill it with pellets and heat it to form a pellet assembly using the self-adhesive force of the pellets; 3. A method for producing a sheet by rolling the pellet/combined body is disclosed, and Japanese Patent Application Laid-Open No. 1983-1989
Japanese Patent No. 28157 discloses a method in which multi-colored pellets are divided and supplied onto a single conveyor from multi-color nozzles that repeatedly move in a direction perpendicular to the traveling direction of the conveyor, and 2. A method for producing a patterned tile is disclosed, in which the colored bevel 1 is melt-molded using a heating roll.

In the method disclosed in Japanese Patent Publication No. 49-3581.5, the mixed resin material pieces are heated and pressed between two templates, and as a result of the heat and pressure, the parts of the material that are in contact with the templates are flowed. ,
Mixing, etc. occurs, but no regular orientation of the pieces or patterns occurs.

As described above, heating and pressing using a template does not result in regular orientation of the non-directionally mixed material pieces, but continuous mass production is impossible.

JP 51-28156 and JP 51-2815
Method No. 7 heat-rolls the mixed colored pellets and is suitable for continuous mass production, but the colored pellets mixed non-directionally by this rolling are oriented in the rolling direction and have a highly non-directional pattern. cannot be obtained.

The purpose of the present invention is to improve the above-mentioned conventional drawbacks, use a rolling method suitable for continuous mass production, and obtain a highly non-directional pattern, and the gist of the present invention is to carry out the rolling process in a multilayered state.

However, the manufacturing method of the present invention involves mixing monochromatic synthetic resin pieces of a predetermined type in a predetermined ratio.

Step 2 of spreading the mixed strips in a layer over the releasable substrate.

Step 3: Heating the spread layer of the mixed strips and, if desired, applying pressure to semi-fuse the strips together.

Step 4: Rolling the semi-fused strips while maintaining the semi-fused state to produce a sintered sheet.

Step 5 of manufacturing a sheet by winding up the sintered sheet and rolling the roll so that the inner layer portion is not oriented.

Slice the above sheet into two or more pieces at the inner layer part,
Wang Cheng 6 with the sliced surface as the product surface.

It consists of the above steps 1, 2, 3, 4, 5.6.

The present invention will be explained in detail with reference to an embodiment shown in the drawings.

The monochromatic synthetic resin strips used in step 1 are monochromatic sheets t-IA, 1B, and ICG made of thermoplastic synthetic resins such as polyvinyl chloride, polystyrene, polymethacrylate, polyethylene, and polypropylene, for example, as shown in FIG. It is then cut into pellets, granules, and flakes using pelletizers 11A, 11B, 11C, etc.

The strips 2A, 2B, 2C preferably have a diameter of 5 to 50 m.
It is preferable that the thickness is about 1.5 m and the thickness is as flaky as possible compared to the diameter.

The strips 2A, 2B, 2C are fed onto a conveyor 12 and conveyed to a mixer 13, where they are mixed.

．． In step 2, as shown in FIG. 2, mixed strips 2 mixed by a mixer 13 are spread in a layer on a conveyor 14 made of a release base material.

When spreading, make sure that the mixed strips 2 do not overlap each other, layer by layer.
It is also desirable to apply two or more layers.

Here, the releasable base material includes release paper, Teflon, silicone rubber, iron plate, stainless steel plate surface (Teflon-treated, silicon-treated, etc.).

In step 3, as shown in FIG. 2, the spread layer 2D of the mixed strips 2 is heated with a heater 15 (for example, a far infrared heater) to semi-fuse the mixed strips 2 together.

In step 4, as shown in FIG.
A sintered sheet 2E is produced by rolling the semi-fused fragment spread layer 2I).

Naturally, the rolling at this time is carried out at a temperature and pressure that can maintain the sheet in a sintered state, that is, the strips are in a semi-fused state, and therefore, depending on the rolling, the strips are completely fused and mixed with each other. It does not occur that the material is oriented in the rolling direction.

In this way, the sintered sheet 2E is wound up as a roll 2F while maintaining the non-directionality during mixing of the pieces.

As a result of the winding, the non-directional sheet 2E becomes multi-layered, and as a result, the non-directionality becomes even higher f and l.

In step 5, as shown in FIG. 3, the rolled material 2F is formed into a sheet by a mixing process 1γ.

At this time, the rolled material 2F is multi-layered and is rolled by the mixing recess 17, but the stress due to the rolling is strongly applied to the surface layer of the multi-layered material, and therefore, in this region, the rolling direction of the pattern is Although orientation occurs, the effect of this stress decreases as you move toward the inner layer due to the stress absorption effect due to interlayer sliding, and in the inner layer portion, the pattern is hardly oriented in the rolling direction, resulting in a high degree of non-directionality due to the multilayering. maintain.

In step 6, the original sheet 2G obtained in step 5 is passed through a roll 18 to a presser roll 19 as shown in FIG.
A and a knife 19B make up the slicer 19, where the product is sliced to obtain product sheets 2H and 2I.

At this time, the original sheet 2G may be sliced and removed from the surface layer having a pattern oriented in the rolling direction, or may be divided into two parts from the center, or may be divided into three or more parts.

In any case, the surface of the product is the sliced surface described above, which corresponds to the inner layer where the non-directional pattern is maintained.

Figures 4 and 5 show the original sheet 1- before and after slicing.
Figure 4 shows the sheet surface of original sheet 12G before slicing, and a surface layer with slight directionality due to rolling appears, while Figure 5 shows the sheet surface after slicing. The sheet surface of original sheet 1-2G is shown, and it can be seen that an inner layer portion having a completely non-directional pattern appears on the sheet surface by being sliced.

In this method, the sheet obtained in Step 5 may be further wound and rolled if desired.

That is, Step 5 may be repeated two or more times.

The greater the number of repetitions of step 5, the more highly non-directional the product will be.

In the present invention, as mentioned above, when creating multiple colors, a predetermined type of monochromatic mixture or resin strips are mixed, so the irregularity is already high in the initial stage, and if the mixing ratio is changed, various patterns can be created. A product is produced, and the spread layer of highly irregular mixed strips is heated and, if desired, pressurized to semi-weld the strips to each other and rolled while maintaining non-directionality. Since the sintered sheet 1 is wound up and the rolled material is rolled, the non-directionality becomes multi-layered, resulting in even greater irregularity, and the rolled surface of the original sheet that occurs when the sintered sheet is rolled. The flow in the rolling direction on the (surface) is erased by interlayer slippage, and the slight directionality caused by this flow remains only on the surface. or by dividing it into two or more and using the sliced surface, which is the inner layer, as the surface of the product. It has a non-directional pattern.

[Brief explanation of drawings]

The figures show a system diagram of an embodiment of an apparatus for carrying out the method of the present invention, FIG. 1 is a system diagram of the manufacturing process of monochrome synthetic resin strips and the mixing process of the strips, and FIG. FIG. 3 is a system diagram of the heating semi-fusion, rolling and winding process of the mixed strips, and FIG. 3 is a system diagram of the rolling and slicing process of the rolled material. In addition, Figures 4 and 5 are photographs substituted for drawings showing the sheet surface of the original sheet. Figure 4 is a photograph showing the sheet surface before slicing the original sheet, and Figure 5 is a photograph showing the sheet surface after slicing the original sheet. This is a photo showing. In the figure, 2A, 2B, 2C... monochrome composite or resin strip, 2... mixed strip, 2D... spray layer,
2F... Roll, 2G... Original sheet,
2H, 2I...Product sheet, 1 1A, 11B
, 11C... Berequiza 1, 13...
・Mixer, 14... Conveyor, 15...
... Heater, 16 ... Pressure roll, 17 ...
...Mixing roll, 19...Slicer.

Claims (1)

[Claims] 1. A method of mixing monochrome synthetic resin pieces of a predetermined type in a predetermined ratio. Step 2 of spreading the above mixed strips on a releasable base material in a layered manner
. Step 3: Heating the spread layer of the mixed strips and, if desired, applying pressure to semi-fuse the strips together. Step 4: Rolling the semi-fused strips while maintaining the semi-fused state to produce a sintered sheet 1. Process 5 of manufacturing a sheet by winding up the sintered sheet and rolling the roll so that the inner layer part is not oriented. Process 6: Slice the above sheet into two or more sheets at the inner layer part, and use the sliced surface as the surface of the product. A method for producing a non-directional, patterned composite resin sheet comprising steps 1, 2, 3, 4, and 5.6.