JPH0683331U - Molding sheet with positioning mark - Google Patents

Abstract

(57) [Abstract] [Purpose] A printed plastic film is adhered to the surface and is accurately and intermittently conveyed to the vacuum / compressed air forming machine in increments of one shot. A plastic molding sheet is used for lateral positioning with a single photocell. A left-right positioning mark 3 whose left-right position is detected by a single phototube 5 is provided at the left-right center along the conveyance direction a of the sheet 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is for molding a plastic formed by adhering a plastic film printed on the surface to a plastic molding such as a lid of an instant noodle container by a molding machine using vacuum or compressed air. For the sheet.

[0002]

[Prior art]

 The lid of an instant noodle container has come to be manufactured by molding a molding sheet of a plastic sheet such as polystyrene having a printed plastic film adhered to its surface by a molding machine.

A molding machine forms a sheet intermittently conveyed one shot at a time into a multi-stage, multi-row product at one time. However, a sheet printed on the surface accurately forms the molding machine. Unless it is transported to, the printed characters and patterns will be misaligned and it will not become a product.

However, since the thickness of the sheet is 0.27 mm, the thickness of the printed sheet is 0.03 mm, and the total thickness of the sheet is 0.3 mm, which is a very thin thickness, it is a pre-forming step. It is easily softened by heating by a heating roll or hot plate and spreads easily. As a result, it becomes difficult to feed to the correct molding position.

In addition, when printing on a film, print misalignment is likely to occur, and when the printed film is adhered to the base sheet, the adhesive misalignment tends to occur. Becomes difficult.

Therefore, in the prior art, as shown in FIG. 3, the front and rear positioning marks 2 ′ are opposed to the left and right edges of the surface of the sheet 1 ′ in the direction orthogonal to the conveying direction a, and the left and right positioning marks are arranged. -Ku 3'was provided along the transport direction a.

The front and rear positions of the sheet 1'are detected by two left and right photoelectric tubes 4 ', and the left and right positions are detected by two photoelectric tubes 5'. The front and rear positions are commanded to a take-up roll drive motor or a sheet transfer chain drive motor (not shown) to stop the seat 1'at a predetermined position. To shift the left and right positions, push members (not shown) are brought into contact with the left and right edges of the sheet 1 ', and a servo motor (not shown) is instructed so that the abutting members are orthogonal to the conveying direction a. I was moving in the direction.

However, the detection of the left and right positions with two photoelectric tubes has a drawback that the structure of the molding machine is complicated and the cost is increased.

[0009]

[Problems to be solved by the device]

 The problem to be solved by this invention is to accurately perform lateral positioning with one photoelectric tube.

[0010]

[Means for Solving the Problems]

 The molding sheet of this invention is characterized in that a left and right positioning mark is provided at the center of the left and right along the carrying direction.

[0011]

[Action]

 If one phototube is installed above the left and right center of the sheet and the left and right positioning marks are detected, the left and right positioning can be accurately performed.

[0012]

【Example】

 Referring to FIG. 1, 1 is a sheet of molding such as polystyrene, on which a printed plastic film is adhered. In the embodiment, the width of the sheet 1 is 820 mm, the length of the sheet 1a for one shot of the molding machine is 620 mm, and 12 molded articles, for example, the lids of instant noodle containers are molded in one shot. It

Reference numeral 2 denotes a front-back positioning mark, which is located at the boundary between the sheet 1a for one shot and the sheet 1b for one shot that follows, and the conveying direction of the sheet 1 on both left and right edges. It is printed in black on the surface of the sheet 1 so as to face in the direction orthogonal to a. In the example, the width is 10 mm and the length is 30 mm.

Reference numeral 3 denotes a left and right positioning mark, which is printed on the surface of the sheet 1 in black at regular intervals in the left and right centers of the sheet 1 along the carrying direction a. In the case of the embodiment, the length is 168 mm, the width is 5 mm, and the interval is 60 mm.

As described above, conventionally, the left and right positioning marks are provided at the left and right edges of the sheet 1 so as to face each other along the carrying direction a and have a length of 30 mm and a width of 10 mm. Therefore, in the case of the embodiment, since the length of the left / right positioning mark 3 can be made long, the width thereof can be narrowed, so that the detection error of the left / right position is half that of the conventional one, and more accurate left / right positioning Will be possible.

Reference numeral 4 is two photocells for detecting the front-rear position, and 5 is one photocell for detecting the left-right position. A pair of left and right 6 is a pressing member which is driven by the servo motor 7 in response to a command from the photoelectric tube 5 to press the left and right edges of the sheet 1 to correct the displacement of the left and right position of the sheet 1.

Reference numeral 8 denotes a vacuum or pressure molding machine, which molds the sheet 1 which has been heated and softened by a heating roll 9 as shown in FIG. 2, for example.

[0018]

[Effect of device]

 Cost can be reduced because only one photocell for left and right position detection, which used to require two in the past, is required.

Since the width of the left and right positioning marks can be narrowed, the correction error of the left and right positions can be made smaller than in the conventional case.

[Brief description of drawings]

FIG. 1 is a plan view of a sheet.

FIG. 2 is a schematic side view of a molding machine.

FIG. 3 is a plan view of a conventional sheet.

[Explanation of symbols]

 1 sheet 2 front / rear positioning mark 3 left / right positioning mark 8 molding machine

Claims (1)

[Scope of utility model registration request] 1. A plastic film having a printed plastic film adhered to the surface thereof and intermittently conveyed to the molding machine for each one shot, has front and rear positioning marks detected by a photoelectric tube on both left and right edges of the surface. In the molding sheet, a molding sheet having a positioning mark, characterized in that a lateral positioning mark is provided at the center of the left and right along the conveying direction.