JPS601184B2 - Method for forming patterns on polyvinyl chloride sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming patterns on polyvinyl chloride sheets,
More specifically, the object of the present invention is to form a desired pattern on the surface of a polyvinyl chloride sheet used for wall materials, floor materials, etc. by gelling a resin base.

An embossing method, a pressing method, a casting method, etc. are known as methods for forming unevenness or a planar pattern on the surface of a thermoplastic resin sheet such as polyvinyl chloride.

However, even if a pattern is formed on the surface of a thermoplastic resin sheet using these methods, the pattern tends to disappear if the resin sheet is heated to a temperature higher than the molding temperature, so it is difficult to ensure that the final product does not lose its shape. It was extremely difficult to make the pattern remain. The present invention eliminates the practical drawbacks recognized in the above-mentioned methods of forming patterns on conventional thermoplastic resin sheets, especially polyvinyl chloride sheets, and makes it possible to realize patterns that do not lose their shape on the sheet surface. This is its main purpose.

Another main object of the present invention is to have a smooth, curved surface with an excellent pattern through a relatively small number of steps, and which can be used as a wall material or a floor covering for heavy walking where the pattern forms part of the thickness of the sheet. The object of the present invention is to provide new technical means for producing polyvinyl chloride sheets that can be used.

The object of the present invention is to provide a method for forming a pattern on a polyvinyl chloride sheet, which comprises a polyvinyl chloride sheet having a weight equal to or more than the weight of the resin component.
In order to form depressions on the surface of a polyvinyl chloride sheet containing an inorganic filler of up to twice the weight, a process of embossing is performed, and after supplying a polyvinyl chloride resin paste at least into the depressions, a doctor This can be advantageously achieved industrially by employing the method described above, which comprises the steps of removing the excess resin paste from the surface of the sheet with a knife, and heating the resin paste to gel it.

The present invention will now be described in detail with reference to the accompanying drawings.

In the drawings, FIG. 1 is a process connection diagram illustrating the first embodiment of the present invention, and FIG. 2 is an enlarged longitudinal cross-sectional view of a polyvinyl chloride sheet with depressions formed therein. 3 and 4 are enlarged longitudinal sectional views of respective sheets immediately after removing excess resin paste in the first and second embodiments of the present invention, and FIGS. 5 and 6 are
FIG. 4 is an enlarged longitudinal cross-sectional view of the respective final products corresponding to FIGS. 3 and 4; 1, 2, 3 and 5, a first embodiment of the invention is illustrated in detail. In these drawings, a polychlorinated pinyl sheet 20 containing an inorganic filler whose weight is equal to or more than three times the weight of the resin component is supplied under heating between a force rendering roll 12 and an embossing roll 10, and its surface is heated. A depression is formed in the thickness direction. In the first embodiment of the present invention, the depth of the depression is determined in advance in order to form a resin paste surface substantially at the same height as the surface of the sheet 20 in the final product as shown in FIG. It is desirable to adjust the height of the protrusions on the surface of the embossing roll 10, so that when forming the recesses with the embossing roll 10 or the like, the height of the surface projections of the embossing roll 10 is adjusted so that the depth of the recesses from the surface of the sheet 20 accounts for at least 20% of the thickness of the sheet. Select. Note that the inorganic filler in the present invention means an inorganic filler that can be blended into polyvinyl chloride resin, such as calcium carbonate, clay, and shirasu balloon, and among them, calcium carbonate is most suitable. The sheet 20 moving in the direction of the arrow in FIG.
The sheet 2 is filled with a polyvinyl chloride resin paste 30 supplied from
The excess amount of the resin paste is removed by a doctor knife 16 that scrapes off the resin paste 30 supplied to the surface of the sheet material. As a result of this adjustment, a resin paste surface is formed that is slightly lower than the surface of the sheet 20, as shown in FIG. In order to form such a lowered resin paste surface, the thickness of the sheet 20 should be 2 or 3 ribs, and the depth of the depression should be 0.4 or 0.8 ribs. It is desirable to select the shape and pressure of the pressure part. The sheet 20 from which excess resin paste has been removed is introduced into the heater 18 with an appropriate amount of resin paste 30 filled in the recesses, and heated to a gelling temperature. By this heating, the resin paste 30' is solidified to form a resin paste surface substantially at the same height as the surface of the sheet 20, as shown in FIG. Next, a second embodiment of the present invention will be described with reference to FIGS. 1, 2, 4 and 6. In this embodiment as well, the polyvinyl chloride sheet 20 contains an inorganic filler whose weight is equal to or more than three times the weight of the resin component, as in the first embodiment, but the method for forming the depressions and the filling of the resin paste are The procedure is slightly different from the first embodiment. That is, in the second embodiment, the depressions have a depth from the surface of the sheet 20 of at least 15 mm relative to the thickness of the sheet.
% is desirable. The depressions of the sheet 2 are filled with polyvinyl chloride resin paste 30 supplied from the hopper 14, and the resin paste 3 that comes into contact with the surface of the postscript sheet 20 has a scraping action. The excess of the resin base is removed by a doctor knife 16 that provides a A thin layer of resin paste is formed over the entire surface, the upper surface of which is substantially flat. To form such a thin layer of resin paste whose upper surface is substantially flat, the thickness of the sheet 20 may be between 2 and 3.
The depth of the depression when filling the resin paste on the side is 0.3
The shape and pressure of the pressurizing part of the embossing roll, and the relationship between the doctor knife and the sheet surface are adjusted so that the thickness of the resin paste is 0.2 and 0.8. It is desirable to adjust the gap size. The sheet material, with the resin paste filled in the depressions and forming a thin layer of substantially flat resin paste over the entire surface of the sheet 20, is then introduced into the heater 18 and heated to the gelling temperature. By this heating, the resin paste 3 is solidified as it is, and a substantially flat resin paste surface is formed on the upper surface of the sheet 20 as shown in FIG. In addition, in the second embodiment of the present invention, as a modification, the sheet 2 described above is modified by relatively changing the relationship between the depth of the depression and the thickness of the thin layer of the resin paste.
Instead of a resin paste surface having a substantially flat upper surface extending over the entire surface of the recess, it is also possible to form a resin paste surface in which the upper surface of the depression forming portion is slightly raised.

In carrying out the present invention, the polyvinyl chloride sheet 20 and the resin paste 3 contain an inorganic filler in order to form a substantially flat resin paste surface on the upper surface of the sheet 20 in the final product as described above. In addition to the amount, it is desirable to adjust the type and content of the plasticizer, stabilizer, or dispersant, etc. according to a conventional method, and the gelation temperature in the heating step is also adjusted depending on the composition of the resin sheet and paste. Furthermore, by varying the colors of the pigments blended into the resin sheet and the paste material, it is possible to form different color patterns or shading patterns of the same color on the surface of the final product. Hereinafter, the method of the present invention will be explained by examples, but the gist of the present invention is not limited in any way by these examples.

Example 1 DOP for parts by weight of PVCIOO with an average degree of polymerization of 1000
40 parts by weight, 3 parts by weight of epoxy plasticizer, 3 parts by weight of stabilizer, 1 part by weight of solvent, 190 parts by weight of calcium carbonate, and 0.5 parts by weight of light green pigment. A polyvinyl chloride sheet with a thickness of 2.5 was prepared.

On the other hand, as a resin paste for polyvinyl chloride, PVCI
An emulsion polymerized PVC composition was prepared by blending parts by weight of DOP5, 3 parts by weight of a Ba-Zn stabilizer, and 0.4 parts by weight of a dark green pigment with respect to parts by weight of OO, and was supplied into a popper. The above-mentioned polyvinyl chloride sheet was fed between a calender roll and an emboss roll under a heating temperature of 185°C, and a depression with a depth of 0.5 ribs was formed in the thickness direction from the surface, and the polyvinyl chloride sheet was Filled with pinil resin paste. Next, a doctor knife is pressed against the surface of the sheet to remove excess resin paste and form a resin paste surface that is slightly lower than the surface of the sheet, and then the sheet material is fed into a heater and heated to 17500°C to form a resin paste inside the recess. The resin paste filled in was gelled. As a result, the final product had a resin paste surface substantially at the same height as the surface of the sheet as shown in FIG. Example 2 When resin paste is filled into the depressions formed in a polyvinyl chloride sheet, the thickness of the resin paste is reduced to 0.
The sheet material was processed according to the same process conditions as in Example 1 above, except that the gap size between the doctor knife and the top surface of the sheet was adjusted to form a thin layer of resin paste with three ribs, and the polyvinyl chloride sheet was A shading pattern was formed on the surface.

As a result, the final product had a substantially flat resin paste surface as seen in FIG. As can be easily understood from the above description, the method of the present invention has excellent utility as a technical means capable of producing polyvinyl chloride sheets having a substantially smooth patterned surface under stable operating conditions. There is.

In addition, the method of the present invention can form various patterns with excellent peel resistance on the surface of the sheet material by changing the emboss shape and the color of the resin component, so the pattern-forming surface has good wear resistance. Coupled with the advantage of having stain resistance, it can greatly contribute to expanding the uses of final products.

[Brief explanation of the drawing]

FIG. 1 is a process connection diagram illustrating the first embodiment of the present invention, FIG. 2 is an enlarged longitudinal cross-sectional view of a polyvinyl chloride sheet with depressions formed therein, and FIGS. 5 and 6 are enlarged longitudinal cross-sectional views of the respective sheets immediately after removing excess resin paste in the first and second embodiments, and FIGS. 5 and 6 show the respective final products corresponding to FIGS. 3 and 4. It is an enlarged longitudinal cross-sectional view. 20: Polyvinyl chloride sheet, 30: Polyvinyl chloride resin paste. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A method for forming a pattern on a polyvinyl chloride sheet, which method involves forming depressions on the surface of a polyvinyl chloride sheet containing an inorganic filler whose weight is equal to or more than three times the weight of the resin. filling the recesses with a polyvinyl chloride resin paste and then removing excess resin paste from the surface of the sheet with a doctor knife; The method described above comprises the step of heating the resin paste to gel it. 2 A method for forming patterns on polyvinyl chloride sheets, in which embossing is used to form depressions on the surface of polyvinyl chloride sheets containing an inorganic filler whose weight is equal to or more than three times the weight of the resin. After supplying the resin paste of polyvinyl chloride into the recesses and onto the surface of the sheet having the recesses, excess amount is removed from the sheet surface using a doctor knife so that a thin layer of resin paste remains on the sheet surface. The method described above comprises a step of removing the resin paste, and a step of heating and gelling the resin paste remaining in the recesses and on the sheet surface.