JPS6154576B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blow molding method that allows a label to be easily attached to a product during blow molding of the product.

When a product such as a hollow container with a label is to be obtained, a label is usually attached to the surface of the product after blow molding the product. In addition, when a label is attached to a product after blow molding, the surface of the label generally protrudes from the surface of the product, which may impair the appearance or cause the products to collide with each other during transportation after the label attachment process. There is a risk that the label may be damaged by scratches or peeled off.

Therefore, in order to eliminate such inconveniences, Japanese Patent Publication No. 47-43622 and Utility Model Publication No. 47-32823 disclose that by attaching a label to the product at the same time as blow molding, A blow molding apparatus has been proposed that makes it easy to attach a label to a product by eliminating the need for the step of attaching a label, and that can produce a product with a more preferable form than a product that has a label attached after blow molding.

However, all of the above-mentioned blow molding apparatuses attach labels in an extremely complicated manner.

That is, in the device described in Japanese Patent Publication No. 47-43622, the molds (split molds) are not moved linearly back and forth, but are fixed to annular rails and moved in a circular manner to open and close the molds. A label holder annular rail is provided outside the annular rail of one of the molds, and the label holder is extendable and retractable on this annular rail, and the label holder is moved in an annular shape while receiving the labels in the label magazine. And the label holder is extended when the label is delivered into the cavity of the mold.

Furthermore, in the device described in Japanese Utility Model Publication No. 47-32823, a pair of molds is opened and closed by moving the molds linearly back and forth, but the label is held at the tip of the label holder. The label holder must be moved in two directions so that the head is fixed between the molds and then positioned within the cavity of the mold, and the label magazine is also moved back and forth. .

Therefore, an object of the present invention is to provide a novel blow molding method that allows label attachment during blow molding to be carried out in an extremely simple manner.

That is, in the present invention, when discharging the product, the mold is separated and moved without being perpendicular to the direction of the parting line, and when the mold is separated, the label held in the label magazine is moved by the label holder. A blow molding method in which the label magazine is held in a cavity of a mold through The direction in which the labels are stacked and stored is oriented in a direction substantially perpendicular to the moving direction of the label holder, and a head for removably holding the label is provided at the tip of the label holder so as to be substantially opposite to the labels in the label magazine. The label holder is provided so as to be able to swing and rotate between a direction in which the head is placed in the label magazine and a direction that is substantially opposite to the cavity in the mold. A blow molding method characterized in that the label is taken out and held in the head, and the label held in the head is held in the mold with the head substantially facing the mold. By providing this, the above objectives have been achieved.

Hereinafter, one embodiment of the blow molding method of the present invention will be described with reference to the drawings.

The drawing shows essential parts of an example of an apparatus used in the blow molding method of the present invention, in which 1 and 1' are a pair of molds, and 2 and 2' are label holders.

The molds 1 and 1' move forward in the direction of arrows A and A' from the separated state shown by the solid line, collide at the two-dot chain line position approximately in the center of the drawing, and move back to the solid line position again. It has been done. Also, mold 1,
In order to carry out the blow molding method of the present invention, the parting line 3 (dotted line indicated by B-B) of 1' is aligned in the A and A' directions so as not to be perpendicular to the movement of the molds 1 and 1' as described above. It is formed at an angle of about 45 degrees. Furthermore, the molds 1 and 1' are provided with through holes (not shown) on the inner surfaces of the cavities 10 and 10' in communication with a vacuum pump (not shown) for adsorbing and holding the label. In addition, molds 1, 1'
can also be moved upwards to receive the parison.

In addition, the label holders 2, 2' hold the labels 5, 5, . . . and 5', 5', . As shown in the figure, when the molds are separated, they are held in the molds 1, 1', more specifically, in the cavities 10, 10', in a direction perpendicular to the direction of the parting line 3 of the molds 1, 1'. It is designed so that it can only move in a straight line. The label magazines 4, 4' are arranged so that the stacked storage direction of the labels 5, 5, . . . and 5', 5', . There is. To explain the label holders 2, 2' in more detail, the label holders 2, 2' take out and hold the labels 5, 5' from the label magazines 4, 4' on their heads 20, 20' at the positions indicated by two-dot chain lines, Go beyond the solid line position and move forward in the directions of arrows C and C' to attach labels 5 and 5' to cavities 1 and 1 of molds 1 and 1'.
0, 10', and then retreats to the position indicated by the two-dot chain line in preparation for taking out the next label 5, 5'. And the heads 20, 20' are
Mechanism similar to this type of conventional product (e.g. suction mechanism)
The label 5, 5' can be detachably held by the label magazine 4, 4' in the direction opposite to the label 5, 5' in the label magazine 4, 4' (see the two-dot chain line position. At this time, the head 20, (one end of the bottom of the label holder 20' is in contact with the label holder 2, 2');
Direction facing the cavities 10, 10' of the molds 1, 1' (see solid line position. At this time, the heads 20, 2
The other end of the bottom of the label holder 0' is in contact with a stopper 21, 21' provided on the label holder 2, 2'. Head 20,2
Such a swing rotation of 0' is achieved by attaching the heads 20, 20' to the tips of the label holders 4, 4' so as to be able to rotate within the above swing rotation range, and also by moving the label holders 2, 2'. This is done by pressing one end of the head 20, 20' against the inclined member 6, 6' provided substantially parallel to the direction by a spring, and moving the label holder 2, 2' with respect to the inclined member 6, 6'. I can do it. Note that the labels 5, 5' transferred into the cavities 10, 10' by the label holders 2, 2' are held within the cavities 10, 10' by the vacuum force as described above. Also, labels 5, 5' used in the present invention
Preferably, the surface of the parison is coated with a resin of the same quality as the parison in order to ensure that the label can be attached more reliably.

In addition, although not shown, a blow molding die for extruding the parison is disposed above the center of the drawing.

Next, an embodiment of the blow molding method of the present invention using the above-mentioned apparatus will be described.

First, when opening the molds 1 and 1' as shown in the figure after discharging the product (molded product), the label magazine 4,
Labels 5, 5' in the label magazines 4, 4' are placed in the heads 20, 2 so as to be substantially opposite to the labels 5, 5' in the labels 4'.
The label holders 2, 2' (see the two-dot chain line), which have been taken out and held in advance at 0', are moved forward in the directions of arrows C and C', and as the label holders 2, 2' move, the heads 20, 20 ′ as mold 1,
1' (see solid line), and the heads 20, 2
The labels 5, 5' held at 0' are transferred into the cavities 10, 10', and the labels 5, 5' are suctioned and held on the inner surfaces of the cavities 10, 10' by vacuum force. In this case, since the direction of transfer of the molds 1, 1' (direction of arrows A, A') is not perpendicular to the direction of the parting line 3 as described above, the movement of the label holders 2, 2' The molds 1, 1' do not get in the way, and the label holders 2, 2'
The labels 5, 5' can be easily held in the molds 1, 1' by simply moving the labels 5, 5' linearly as described above.

After holding the labels 5, 5', the label holders 2, 2' are moved back to the heads 20, 2'.
20' to label magazine 4, label 5 in 4',
While the labels 5, 5' in the label magazines 4, 4' are taken out and held by the heads 20, 20' substantially opposite to the label holders 2, 2', the normal blow molding operation is performed when the label holders 2, 2' are in the retracted state. conduct. That is,
For example, the molds 1, 1' are raised to receive the parison into the cavities 10, 10', and after cutting the parison, the molds 1, 1' are lowered, and blowing is performed with the molds 1, 1' in the closed state. The molds 1 and 1' are opened and the product is discharged. After discharging the product, attach the labels 5 and 5' to the cavities 10 and 1 again as described above.
It is kept within 0'. In the product thus obtained, the parison is expanded by blowing so as to avoid only the labels 5, 5' held in the cavities 10, 10'.
The surface of the label 5' and the surface of the product are on the same plane, and the surface of the label 5, 5' and the surface of the product are integrally continuous at the periphery of the label 5, 5'. , beautiful appearance, label 5,
There is no risk of peeling of 5'.

Incidentally, according to the above-mentioned device, the cavities 10,1
Since the labels 5 and 5' are held in each cavity, a product with labels 5 and 5' attached to both sides is manufactured. However, when attaching a label to only one side of the product, only one cavity is Just keep the label. Moreover, it goes without saying that the blow molding method of the present invention is not limited to the method using the above-mentioned apparatus.

As described above, according to the blow molding method of the present invention, a blow molded product with a label can be easily manufactured at the same time as the blow molding by simply holding the label in the mold and performing normal blow molding. is possible,
Further, when discharging the product, the mold is separated and moved without being perpendicular to the direction of the parting line, and a head is provided at the tip of the label holder so that it can swing and rotate so as to face a predetermined direction as the label holder moves. Because of this, the label can be easily held in the mold by simply moving the label holder in a straight line, and the surface of the label and the surface of the product can be positioned on the same plane, and the label can be held at the periphery of the label. Since the surface of the product can be integrally continuous with the surface of the product, it is possible to improve the appearance of the product and prevent the label from being damaged or peeled off when the blow-molded product with the label is transported. It will be done.

[Brief explanation of the drawing]

The drawing is a plan view of essential parts of an example of an apparatus used in the blow molding method of the present invention. 1,1'...Mold, 2,2'...Label holder, 3...Parting line, 4,4'...Label magazine, 5,5'...Label, 20,20
... Head.

Claims (1)

[Claims] 1 When discharging the product, the mold is separated and moved without being perpendicular to the direction of the parting line, and when the mold is separated, the label held in the label magazine is transferred to the mold through the label holder. A blow molding method in which the label holder is held in a cavity, and the label holder is provided so as to be linearly movable only in a direction substantially perpendicular to the parting line, and the label magazine is arranged so that the labels are stacked and stored. A head is provided in a direction substantially perpendicular to the moving direction of the label holder, and a head for removably holding the label is attached to the tip of the label holder in a direction substantially opposite to the label in the label magazine and in a direction substantially opposite to the label in the label magazine. The label holder is provided so as to be swingable and rotatable between a direction substantially opposite to the cavity, and by moving the label holder, the head is made to substantially oppose the label in the label magazine, and the label in the label magazine is placed in the head. Take out and hold;
A blow molding method characterized in that the label held by the head is held in the mold with the head substantially facing the mold.