JPH06874A - Production of sheet like molded article - Google Patents

Abstract

PURPOSE:To form an embossed pattern to a sheet main body subjected to mirror surface finish in an unmelted state. CONSTITUTION:A sheet main body 1 of which both inner and outer surfaces 1a, 1b are subjected to mirror surface finish is passed through cooling drums (b), (b) to be forcibly cooled to a specified surface temp. or lower to be set to an unmelted state and the sheet main body set to the unmelted state is passed through the nip of desired embossing rolls (c), (c) while held to the specified surface temp. or less and an embossed pattern 2 showing a commodity name is formed to the arbitrary place of the outer surface 1b of the sheet main body 1.

Description

Detailed Description of the Invention

[0001]

The present invention relates to, for example, VTR tapes,
The present invention relates to a method for producing a sheet-shaped molded article having an squeezing pattern that forms an outer case for stationery or cosmetics, a hard cover for books, a file case, or the like. In the present specification, the sheet is not limited to a sheet having a thickness generally called, but includes a sheet having a thickness called a film and is not limited in any way.

[0002]

2. Description of the Related Art Conventionally, a continuously supplied melt of polypropylene or the like is passed through a squeezing roll which is kept at a predetermined temperature or less through cooling water, and is then rolled and solidified by cooling to obtain a desired material on the entire surface or at an arbitrary position. A sheet-shaped molded product having a simple striation pattern was formed.

[0003]

Therefore, when rolling and squeezing with a squeezing roll, the squeeze pattern was passed between the rolls in a molten state. According to this method, the squeezing pattern transferred to the sheet by the rolls is used. However, there is a drawback in that the distance between the sheets varies depending on the difference in shrinkage of the sheet.

It is an object of the present invention to provide a method for producing a sheet-shaped molded article which is excellent in dimensional stability and which forms a drawn pattern in a non-melted state on a mirror-finished sheet body.

[0005]

In order to achieve the above object, the technical means of the present invention is to form a sheet body by mirror-finishing at least one of the inner and outer surfaces, and then forming the sheet surface. The finished sheet body is naturally cooled or forcedly cooled to a predetermined surface temperature or less to be in a non-melting state, and the sheet body in the non-melting state is passed through a desired squeezing roll while maintaining the predetermined surface temperature or less to give a mirror-finished surface. It is to form a squeeze pattern on the entire surface or an arbitrary place.

[0006]

EXAMPLE An example of the present invention will be described. The outline is a mirror finishing step A-> cooling step B-> squeezing step C. The details will be described below.

First, a desired synthetic resin or the like, for example, a melt 1'of polypropylene or the like, which is continuously supplied, is rolled by passing between desired smooth rolls a and a, and then cooled and solidified to form both inner and outer surfaces 1a and 1b. Sheet body 1 with mirror finish
Are formed (mirror finishing step A).

Then, the mirror-like sheet body 1 formed as described above is forcibly cooled to a predetermined (surface) temperature or lower to a non-melted state before shifting to the next drawing step C. (Cooling step B).

That is, the surface temperature of the sheet body 1 is forcibly cooled to about 70 ° C. or less by passing the cooling water through the cooling drums b whose outlet temperature is controlled to about 70 ° C. or less (surface temperature). .

Next, the forcedly cooled non-melted mirror-like sheet body 1 is rolled by passing it between the squeezing rolls c provided with irregularities forming a squeezing pattern at desired locations.
A sheet-shaped molded product 3 in which a desired squeezing pattern 2 is formed is formed on a predetermined portion of the outer surface 1b of the mirror-like sheet body 1 (squeezing step C). Although the sheet temperature is not limited, it is preferably 100 ° C. or lower in consideration of sheet deformation and the like.

The sheet-shaped molded product 3 formed as described above is punched into a desired shape by, for example, a well-known technique, and then assembled to form the desired VTR tape exterior case 4. In addition to the VTR tape outer case 4, an outer case for stationery or cosmetics, a hard cover for books, a file cover (not shown), or the like may be configured.

Therefore, in the case of forming the outer case 4 for the VTR tape as described above, when it is desired to display the product name, the quality indication, etc. at a predetermined position of the case, the predetermined case of the mirror-like outer case 4 is selected. It is also possible to display the product name, quality indication, etc. on the place by the drawing pattern 2.

In the above embodiment, the forced cooling step B of the sheet body 1 is separately installed between the mirror finishing step A and the drawing step C (in-line case is explained), but the present invention is not limited to this. However, in the case of off-line, the seat body 1 may be at room temperature (natural cooling) and is optional. Also, the seat body 1
Has an arbitrary thickness, and may be a single layer or a laminated layer, and may be transparent, semitransparent, opaque, or the like.

In the above embodiment, the sheet body 1 has been described with the inner and outer surfaces 1a and 1b being mirror-finished, and the diaphragm pattern 2 is formed only on the mirror-like outer surface 1b, but this is only one embodiment. The seat body 1 may be any one as long as at least one of the inner and outer surfaces 1a and 1b is mirror-finished, and the squeezing pattern 2 is formed on either of the mirror-finished surfaces. 2 may be formed and can be appropriately changed. Further, the squeezing pattern 2 may be provided not only on a part of the seat body 1 as in the above embodiment, but may be provided on the entire surface of the seat body 1. Further, contrary to the above embodiment, the mirror-like seat body may be provided. The squeezing pattern is formed on the entire surface except for the product name forming portion, and the mirror surface portion not having the squeezing pattern may be formed so as to represent the product name or the like.
Needless to say, the squeezing roll is also changed accordingly.

[0015]

According to the present invention, at least either one of the inner and outer surfaces is mirror-finished to form a sheet body, and then the mirror-finished sheet body is naturally cooled or forcedly cooled to a predetermined surface temperature or lower. To a non-melted state,
Then, the sheet body in the non-melted state is passed between desired squeezing rolls at a predetermined surface temperature or lower to provide a method for producing a sheet-shaped molded product which forms a squeezing pattern on the entire surface of a mirror-finished surface or at an arbitrary position. When the squeezing pattern is formed on the sheet-like sheet body, the squeezing pattern is formed on the entire surface of the mirror-like sheet body or at a desired position in the unmelted state (without reheating) without melting the sheet body by reheating or the like. can do.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a view showing a formed state of a sheet-shaped molded product.

[Explanation of symbols]

 A: Mirror finishing process a: Smooth roll B: Cooling process b: Cooling drum C: Squeezing process c: Squeezing roll 1: Sheet body 1a: Inner surface 1b: Outer surface 2: Squeezing pattern 3: Sheet-shaped molded product 4 : Exterior case

Claims (1)

[Claims] 1. A non-molten state in which at least one of the inner and outer surfaces is mirror-finished to form a sheet body, and the sheet body having the mirror-finished surface is then naturally cooled or forcedly cooled to a predetermined surface temperature or lower. And, the sheet-like molded article, characterized in that the sheet body in the non-melted state is passed between desired squeezing rolls at a predetermined surface temperature or lower to form a squeezing pattern on the entire mirror-finished surface or at an arbitrary position. Production method.