JPH0615201B2 - Label insertion method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> At present, there are roughly two methods of plastic hollow molding. One is a method called stretch molding method, in which a test tube-shaped bottomed parison (called a preform) is made by injection molding, and a longitudinal drawing rod (called a drawing rod) is used to draw in the longitudinal direction. It is a method of obtaining a desired plastic molded product while laterally stretching it in a hollow molding die by blowing air. Another method is called a direct blow molding method, in which a resin melted by an extruder is tubular ( (Referred to as a parison), the bottom of the parison is sealed in a hollow molding die, and a desired plastic molded product is obtained by blowing air.

The present invention relates to a label inserting machine for inserting a label into a hollow molding die in the above two molding methods (stretch molding method and direct blow molding method), and more specifically, a film label, a thin paper label, and a non-woven label. The present invention relates to a label inserting machine that is used when a plastic hollow molded product having a label is inserted into a hollow molding die.

<Prior art> As a labeling method for a conventional plastic hollow molded product (hereinafter referred to as a plastic bottle), a plastic bottle manufactured by a stretch molding method or a direct blow molding method is labeled with a product name or the like in a secondary processing step. The method of pasting was common.

However, in recent years, when a plastic bottle is made by stretch molding or direct blow molding, a product name or the like is printed in a hollow molding die (hereinafter referred to as a die), and the label backside is coated with an adhesive (hereinafter referred to as a label). (Referred to as “in-mold label forming method”) is used, and the secondary processing step tends to be omitted. It is in.

<Problems to be solved by the invention> However, in the above-mentioned in-mold label forming method, a magazine for label stock (hereinafter referred to as a magazine) must be used.
The thin paper label, the non-woven fabric label, the plastic film label, etc., which have already been punched out, are placed on the magazine, transferred to the insertion machine, and inserted into the mold to take two labels by static electricity etc. In addition, label adsorption failure or misalignment due to label curl or the like is unavoidable, and the occurrence of failure was remarkable.

Further, it was difficult to stock the label in the magazine due to the curl of the label in the vertical and horizontal directions.

<Means for Solving Problems> The present invention has been made to solve the above problems,
In the in-mold label forming method, instead of installing a magazine to stock the labels in the label inserting machine, the labels are wound and supplied, and the label punching machine attached to the label inserting machine punches the labels and inserts them by vacuum etc. at the same time. The present invention relates to an inserting method and an apparatus for a label inserting machine of an in-mold label forming method, which is characterized in that it is sucked onto and held in a mold.

Next, the present invention will be described in detail with reference to the drawings.

The label inserting machine according to the present invention has a structure as shown in Fig. 1 and is provided with a concave die (1) and a convex die (2).
(3) is punched out, and then the label is vacuum-held by the insertion arm (4) of the label suction machine (14), inserted into the die (5), and transferred and held in the die (5). Examples of the label include a film label made of PET film, a thin paper label of about 30 g / m ² or less, a breathable non-woven fabric, and the like, and
It is effective to coat the back side of the print with a thermoplastic adhesive.

To manufacture a plastic bottle using the label inserting machine in the present invention, first, pass the label (3) between the concave die (1) and the convex die (2) of the label punching machine (13), and ,
It is held by a positioning roll (6), the label (3) is punched out by the concave die (1) and the convex die (2) to make a sheet-fed label, and at the same time, the insertion arm of the label suction machine (14) ( The sheet label is vacuum-held by 4), is inserted into the die (5), is vacuum-held by the die (5), and the insertion arm (4) is retracted. At the same time, the mold (5) goes into the mold closing, and the parison already inside the mold (5) is blown with a blow pin and made into a plastic bottle shape by the adhesive coated on the refundable mold surface of the sheet label. The label adheres to the blown parison by the heat of the parison. After depressurizing the plastic bottle, the mold (5) is opened to obtain a plastic bottle molded product having a label.

<Examples> Next, the present invention will be described in detail with reference to Examples. A PET film (thickness 100 μm), on which a pattern was printed in three colors by a gravure printing machine, was coated with an EVA-based adhesive on the opposite surface using a coater, and the label was wound up and attached to the insertion machine.

On the molding machine side, a parison was made using polyethylene resin, and the mold used was a 500 ml cylindrical bottle.

With a resin temperature of 190 ° C. and a mold temperature of 7 ° C., a plastic bottle was molded in a molding cycle of 18 seconds (including the operation time of the label inserting machine), and a plastic bottle having a transparent film label on the barrel could be obtained.

<Effects of the Invention> Since the label inserting machine of the present invention has a die for the label inserting machine, not only the problems such as the difficulty of stocking the label in the label magazine due to the curl of the label are solved. It is possible to eliminate the two labels taken by static electricity and the mistake of sucking the labels, and it has a great effect of reducing defects.

[Brief description of drawings]

The drawings are for explaining the present invention, and FIG. 1 is a top view of the label inserting machine. FIG. 2 is a front view of the label inserting machine. FIG. 3 is a view after the arm of the label inserting machine is extended and the punched label is inserted into the mold. (1) Concave type, (2) Convex type (3) Label, (4) Insert arm (5) Mold, (6) Positioning roll (7) Arm opening / closing cylinder (8) Label suction pad (9) Convex punch cylinder (10) Back plate (11) Convex guide plate (12) Tie bar (13) Label punching machine (14) Label suction machine

Claims (2)

[Claims] 1. When molding a hollow plastic product,
In a molding method in which the label is inserted into the mold in advance and then the desired molded product is molded and the label is applied at the same time, the label material is supplied by winding and punched into the desired shape and punched simultaneously. A label insertion method, which is characterized by taking out from a mold and inserting it into a mold. 2. A device for hollow-molding plastic and applying a label at the same time, which comprises a label punching machine having a concave die and a convex die, a movable label suction machine and a die. The label is passed between the convex die and the convex die, the label is punched by the concave die and the convex die, the punched label is adsorbed by the label adsorption machine, and the label adsorption machine is placed in the die. A label inserting device, characterized in that the label is held in the mold by moving the label into the mold.