JPS625051B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming multicolored convex patterns on thermoplastic synthetic resin sheets used for flooring, wall materials, mats such as automobile mats, entrance mats, and other various board materials. be.

To form this kind of convex pattern on the sheet,
A commonly used method is to place a thermoplastic synthetic resin convex pattern original piece of a predetermined shape on a sheet and heat-seal it by high-frequency heating.

The object of the present invention is to form an extremely simple and effective multicolored convex pattern on a sheet by using the above method. The upper and lower sides of a resin convex pattern original piece placed thereon are sandwiched between a pair of electrode plates, and a high frequency electric field is applied to soften the convex pattern original piece and fuse it to the sheet, thereby creating a convex shape on the upper surface of the sheet. In the method for forming a pattern, the convex pattern original piece is a laminate of a plurality of thermoplastic synthetic resin layers each having a different color, and the softening point of the thermoplastic synthetic resin layers is changed from the upper layer to the lower layer. The main idea is to apply a pressing force to the laminate through the pair of upper and lower electrode plates, thereby causing the layer one layer below to protrude around the layer one above.

The present invention will be explained in detail below.

In FIG. 1, numeral 1 is a thermoplastic synthetic resin sheet, for example, a sheet formed by molding a polyvinyl chloride (PVC) mixture having the following composition using a calender or the like.

Composition PHR PVC (=1100) 100 Filler 10 Plasticity 80 Ca-Zn stabilizer 3 Pigment Appropriate amount A thermoplastic synthetic resin convex pattern original piece 2 is placed on the sheet 1, and the convex pattern original piece 2 is a unique upper layer 2A
and a lower layer 2B, the upper layer 2
A and the lower layer 2B are, for example, thermoplastic synthetic resin layers formed by molding a PVC mixture having the following formulation into a sheet using a calender or the like, and hollowing out each sheet in a desired pattern.

Upper layer composition PHR PVC ()=1100) 100 Filler 10 Plasticizer 80 Ca-Zn stabilizer 3 Pigment (red) Appropriate amount Lower layer composition PHR PVC (=700) 100 Filler 10 Plasticizer 80 Ca-Zn System stabilizer 3 Pigment (blue) Appropriate amount As illustrated above, PVC used for sheet 1
If the (average degree of polymerization) is larger than that of the PVC used for the bottom layer of the convex pattern original piece 2, the bottom layer of the small convex pattern original piece 2 will selectively soften when high frequency is applied. This prevents the synthetic resin sheet 1 from softening.

Next, a lower electrode 3 is brought into contact with the bottom surface of the sheet 1, and an upper electrode 4 is attached to the convex pattern original piece 2.
The upper electrode 4 has a recess 4 into which the convex pattern original piece 2 is fitted.
A, and a desired uneven pattern 4B may be formed on the upper surface. Thus, when a high frequency voltage is applied to the electrodes 3 and 4, a high frequency electric field is applied to the sheet 1 and the convex pattern original piece 2, but due to the difference as described above, the lower layer 2B of the convex pattern original piece 2 The upper layer 2A and the sheet 1 are not softened even by selective high-frequency dielectric heating. Then, as shown in FIG. 2, the upper layer 2
When the softened lower layer 2B is pressed against the sheet 1 through A, the lower layer 2B is fused to the upper layer 2A and the sheet 1. At the same time, the lower layer 2B expands laterally due to the pressing force, protrudes from the periphery of the upper layer 2A, rises in the space between the upper layer 2A and the upper electrode 4A, reaches the upper surface of the electrode 4, and spreads around the upper layer 2A. It is surrounded by the lower layer 2B, and at the same time, the uneven pattern of the upper electrode 4 is imprinted on the upper surface of the upper layer 2A. Thus, electrode 3,
4 is removed, on the upper surface of the sheet 1, as shown in FIG. 3, an uneven pattern 21A is formed on the upper surface of the red upper layer 2A, and the upper layer 2A is surrounded by a blue lower layer 2B. is formed.

The present invention is not limited to the above-mentioned embodiments. For example, the upper electrode 4 itself may not be made into a mold, but a separate mold may be attached to the convex pattern original piece 2, and the electrode 4 may be brought into contact with it from above. However, the softening point of the synthetic resin material constituting each layer of the sheet 1 and the convex pattern original piece 2 can be adjusted by changing the amount of plasticizer, or even by changing the type of synthetic resin. It's good to wear.

As described above, in the present invention, a thermoplastic synthetic resin convex pattern piece is placed on a thermoplastic synthetic resin sheet, the top and bottom of which are sandwiched between a pair of electrode plates, and a high frequency electric field is applied to produce the convex pattern. In the method of fusing the piece to the sheet, the convex pattern piece is a laminate of a plurality of thermoplastic synthetic resin layers, and the softening point of the thermoplastic synthetic resin layer decreases from the upper layer to the lower layer. When the convex pattern pieces are fused to the sheet, each layer of the convex pattern pieces deforms more than the layer above and protrudes from the layer, and each layer is surrounded by the layer immediately below. It has the appearance of
It provides an extremely effective design.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side sectional view of a convex pattern piece before fusion molding;
FIG. 2 is a side sectional view of the convex pattern piece after fusion molding, and FIG. 3 is a partial perspective view of the product. In the figure, 1... synthetic resin sheet, 2... convex pattern piece, 2A... upper layer, 2B... lower layer, 3... lower electrode, 4... upper electrode.

Claims (1)

[Claims] 1 A thermoplastic synthetic resin convex pattern original piece is placed on a thermoplastic synthetic resin sheet, the top and bottom of which are sandwiched between a pair of electrode plates, and the convex pattern original piece is softened by applying a high frequency electric field. In the method of forming a convex pattern on the upper surface of the sheet by fusing it to the sheet, the convex pattern original piece is a laminate of a plurality of thermoplastic synthetic resin layers of different colors, and the thermoplastic synthetic resin layer is fused to the sheet. The softening point of the resin layer is lowered from the upper layer to the lower layer, and a pressing force is applied to the laminate through the pair of upper and lower electrode plates, thereby causing the layer one layer below to protrude around the layer one above. A method for forming a multicolored convex pattern on a synthetic resin sheet, characterized by: