JPS61239935A - Method for molding receiving tray for different two-layered packing - Google Patents

Abstract

PURPOSE:To naturally regulate the difference between the degrees of elongation of a hard synthetic resin film and an expanded sheet by the slip of an adhesive by simultaneously adhering both of them at the time of formation without preliminarily performing lamination or coating and delaying the drying of the adhesive, by forming a superposed film from the expanded sheet and the hard synthetic resin film while applying the adhesive to the opposed surfaces of both of them during the conveying thereof and heating the superposed film before closely contacting the same with a mold. CONSTITUTION:A hard synthetic resin film 2 is superposed to an expanded sheet 1 between feed rollers 14, 14 while coated with an adhesive by a coating roller to be fed to a vacuum chamber 5 along with the expanded sheet 1. Subsequently, a heating chamber 10 is slid to the part above the vacuum chamber 5 to perform the heating of the fed superposed film. Prior to performing the evacuation of the vacuum chamber 5, high pressure air is sent from a communication pipe to inflate the superposed film upwardly to form slackening and, thereafter, sucking action is performed to absorb the superposed film by a mold 6 to adhere the superposed film simultaneously with molding.

Description

Detailed Description of the Invention (a) Field of the Invention This invention is a two-layer film made up of a shock-absorbing foam sheet and a hard synthetic resin film, which is polymerized as one body, and which has a surface that can be used to fit packaging articles. The present invention relates to a method for molding a heterogeneous two-layer packaging saucer having unevenness.

(b) Background of the Invention Conventionally, this type of packaging tray has been manufactured by using a two-layer film that has been laminated or coated in advance and molding the film.

Therefore, a separate lamination or coating process is required before the forming mold, and the foam sheet is thick and difficult to roll into a long length, and when setting it in the device, it is necessary to change the original sheet many times. It had the drawbacks of being inefficient and expensive.

(c) Purpose of the Invention This invention is an object of the present invention, which eliminates the need for a laminating or coating process by adhering simultaneously to the forming mold without prior lamination or coating, and improves work efficiency. The purpose of the present invention is to provide a method for forming a saucer for double-layer packaging.

(D) Summary of the Invention This invention involves forming a polymeric film by applying an adhesive to the opposing surfaces of a foam sheet and a hard synthetic resin film during transportation, heating the polymeric film, and then inserting it into a mold. The method is characterized in that it is a method of molding a packaging tray with two different layers in close contact with each other.

(e) Effects of the invention According to this invention, after heating a polymerized film of a foamed material sheet and a hard synthetic resin film, it is placed in a mold with a spoon,
Since it is attached at the same time as forming, it improves work efficiency while eliminating the need for expensive sheets laminated or coated in advance, and also slows down the drying of the adhesive if the elongation rate of the foam sheet is poor during forming. As a result, the difference in elongation between the hard synthetic resin film and the foam sheet is naturally adjusted by the slippage of the adhesive, which reduces sheet tearing and molding defects, making it possible to obtain molded products at low cost. can.

(f) Examples of the invention An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows a molding device for a heterogeneous two-layer packaging tray, in which 1 is a foam sheet made of polyethylene, polypropylene, etc.;
3 is a hard synthetic resin film made of vinyl chloride, 3 is a coating roller, 4 is an adhesive tank in which the coating roller 3 is pivotally supported, 5 is a vacuum chamber, and the inside of this vacuum chamber 5 is formed into a concave mold 6. is,
A plurality of communication pipes 7 are connected to the bottom of the mold 6 and communicate with the vacuum pump side.

Reference numeral 8 denotes a holding frame, and this holding frame 8 is used to place the polymeric film on the vacuum chamber 5 and then press it from above to seal it.

Reference numeral 9.9 is a pair of rails arranged on one side from the front and rear upper part of the vacuum chamber 5, 10 is a heating chamber equipped with a heater 11 inside, and rollers 12, 12 provided on the front and rear walls of this heating chamber 10.
is placed on the above-mentioned rail 9.9 so as to be able to slide upward or diagonally upward of the vacuum chamber 5.

With the above structure, the foamed material sheet 1 unrolled from the winding sheet 1' is conveyed onto the vacuum chamber 5 by the feed rollers 14 and 14 via the guide roller 13, and
The hard synthetic resin film 2 unwound from the take-up film 2' is coated with adhesive by the coating roller 3, polymerized with the foam sheet 1 between the feed rows 514 and 14, and sent together with the foam sheet 1 to the vacuum chamber 5. transported upwards.

A presser rod 8 is placed on the polymerized film transported onto the vacuum chamber 5 to seal the surrounding wall soil of the vacuum chamber 5, and the heating chamber 10 is slid above the vacuum chamber 5 to perform heating.

Before the vacuum chamber 5 is evacuated, high-pressure air is sent through the communication pipe 7 to swell the polymer film upward to form a slack, and then a suction action is performed to adsorb the polymer film to the mold 6. At the same time as molding, the polymeric film is adhered.

Next, the heating chamber 10 and presser rod 8 are removed from above the polymer film, the polymer film between the vacuum chamber 5 and the feed roller 14 is cut, and the molded product is taken out from the mold 6.

By molding in this way, the foam material sheet 1 is formed in the lower layer.
A molded product is obtained in which a hard synthetic resin film 2 is superimposed on the upper layer.

In addition, if the foam sheet 1 is thick and does not have air circulation, by inserting air circulation holes into the sheet with iQG, it will adhere to the mold with high precision and a molded product with good dimensional accuracy can be obtained. It turns out.

Furthermore, if the elongation rate of the foam sheet is poor during molding, by slowing down the drying of the adhesive, the difference in elongation rate between the hard synthetic resin film and the foam sheet can be naturally adjusted by the slippage of the adhesive. , sheet tearing and molding defects can be reduced, and molded products can be obtained at low cost.

In the above examples, the polymeric film was molded and bonded by vacuum means, but this may also be done by air pressure from above or by forced pressure.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional side view of a forming apparatus for a tray for heterogeneous two-layer packaging, and FIG. 2 is a partial perspective view. 1... Foaming material sheet 2... Hard synthetic resin film 3... Application roller 6... Mold 10...
heating chamber

Claims (1)

[Claims] 1. While transporting the foam sheet and the hard synthetic resin film, a polymer film is formed by applying an adhesive to at least one inner surface of the foam sheet, and after heating this polymer film, it is placed in a mold. A method for forming a dissimilar two-layer packaging tray in which the upper and lower layers have different elasticities and are brought into close contact to form an appropriately shaped product insertion part.