JPH0425432A - Method for supplying label to cavity face of blow mold - Google Patents

Abstract

PURPOSE:To supply a label to both faces of a cavity by operation of one time even when remarkable distance difference is present in the mold opening position by moving the inside split mold to a mold closing holder before a label holder is inserted and equally regulating the mold opening positions of both split molds while keeping a parting line as a center. CONSTITUTION:In the split molds 11a, 11b, since a preform is sent between the molds from the side part in such a state that an arc is drawn and also a molded form is sent out to the opposite side part in the same state, the moving range of the inside split mold 11b is made large. When the inside split mold 11b is retreated and moved larger than the outside split mold and mold opening is completed and the molded form is sent out to the side part from the blow mold, the inside split mold 11b is advanced and moved in the mold closing direction. When the distance of this split mold for a parting line is made equal to the distance between the parting line and the outside split mold 11a, the inside split mold is once stopped. Then a holder 16 having a label on both side faces is inserted between molds from the side part. The label is supplied to both faces of the cavity after stopping.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for supplying labels to both sides of a cavity of a blow mold or the like configured by a pair of split molds having different mold opening amounts. .

[Prior Art] A rotary injection stretch blow molding machine that moves an injection molded preform in a circular manner using a rotary transfer plate or the like to transfer it to a blow mold, and uses the blow mold to mold the preform into a container such as a bottle. It has been known.

FIG. 4 shows an outline of the process using the above-mentioned molding machine, in which the blowing mold 1 and the injection mold 2 are placed at the center of the mold by a circular transfer line a.
It is set on the machine stand below the rotary transfer plate 3.

In addition, the multi-cavity blowing mold 1 and injection mold 2 are formed to be long in the tangential direction in proportion to the number of molds, and the preform 4 and molded product 5 molded by these molds also
Naturally, they move along the circular transfer line a while drawing an arc together with the rotary disk 3 in the form of sticks aligned in the tangential direction.

In this case, in the above-mentioned blow mold 1 consisting of a pair of split molds 1a and 1b, the parting line b located in the tangential direction
The inner and outer molds 1a are divided into two parts.

1b is moved in the radial direction to open and close the mold. In addition, as shown in Fig. 5, the split mold 1 when opening and closing the mold is
The mold opening amount C1d of a and 1b is such that a large number of preforms 4 and molded products 5 arranged in a straight line move in and out from the side in an arc, so if the inner split mold 1b is wide open and hits I try not to.

Inserting a label into such a blowing mold 1 is limited to the side of the mold because the rotary transfer plate 3 is located above the mold. For example, in the prior art described in Japanese Patent Application Laid-Open No. 63-297023, a label insert device equipped with a label feeding device that can move forward and backward is disposed on the side of a blowing mold, and after the mold is opened, left and right pairs of labels are inserted. The holder is inserted between the molds and moved further to the side to simultaneously supply labels on both sides of the holder to both sides of the cavity.

[Problems to be Solved by the Invention] However, in order to supply labels to both sides of the cavity using a pair of label holders, the mold opening amount of the split molds constituting the blow mold is equal, and the parting line that is the center of the mold Therefore, there is no particular problem if the positions of both cavity surfaces are the same, but as the number of cavities increases, the mold becomes larger and the inner split mold inevitably requires a larger mold opening, and If there is a significant distance difference between the mold opening positions of the split molds, it will not be possible to supply labels in -times of operation, and it will be difficult to supply labels within the limited mold opening time. In addition, it is necessary to improve the equipment to supply labels on each side.
There were issues that needed to be resolved, such as high costs.

This invention was devised to solve the above-mentioned problems, and its purpose is to solve the problem even if the inner split mold has a large mold opening amount and there is a significant distance difference between the mold opening positions of the two split molds. The object of the present invention is to provide a new method that allows labels to be supplied to both sides of a cavity in a single operation using a conventional device.

[Means for Solving the Problems] The present invention according to the above object is characterized in that the parting line is located on the circular transfer line of the preform, and the mold opening amount of the split mold on the inner side than on the circular movement line is smaller than that on the outer side. When inserting a boulder from the side of the mold to supply labels to both sides of the cavity of a blowing mold that is set larger than the split mold, the inner split mold must be molded before inserting the boulder. Move in the closing direction, adjust the mold opening positions of both split molds equally around the parting line, and then close the boulder.
The purpose is to supply the label to the cavity surface.

[Operation] When the inner split mold moves backward more than the outer split mold to complete the mold opening and the molded product is sent out from the blowing mold to the side, the inner split mold closes the mold. Move forward in the closing direction. When the distance between this split mold and the parting line becomes the same as the distance between the parting line and the outer split mold, the inner split mold temporarily stops.

Next, a holder having labels on both sides is inserted between the molds from the side, and after stopping, labels are supplied to both sides of the cavity.

Once feeding is complete, the label holder is retracted and pulled out from between the molds, into which the preform is fed from the opposite side. When the preform stops, both split molds move forward to close the mold.

[Example Figures 1 to 3 show examples of the present invention.
In the figure, 11 is a pair of inner and outer split molds 11a.

11b is a blowing mold, 12 is a label feeding device located on the side of the mold, and although it is omitted in the drawing, it is a label insert device equipped with a laher machining machine, and a movable member 13 assembled to be able to move up and down and horizontally. , a horizontal rotary screw shaft 14 in the movable member whose screw directions differ from the center, and the rear end portions of the rotary screw shaft 14 are screwed into both threaded portions of the movable member 13 via members 15, respectively. It consists of a pair of left and right rod-shaped label holders 16 that protrude long and parallel to the front.

Four label adsorption members 17 are attached to the outer surface of the label holder 6 at positions facing the centers of four cavity halves 18 recessed in the parting surfaces of the split molds 11a and llb. The labels 1θ that have been absorbed are simultaneously inserted into the cavity halves on both sides by both label holders 16, which simultaneously move by the same amount to the left and right sides due to the rotation of the rotary screw shaft 14.

Reference numeral 20 designates a holder support shaft arranged in parallel with the rotary screw shaft 14 in the movable member, and 21 designates a rotary transfer plate below the base 22 located above the mold.

Although the split molds 11a and llb are omitted in the drawing,
The molds are opened and closed individually by hydraulic equipment, but as mentioned above, the preforms are fed from the side in an arc between the molds, and the preforms are stretched and blown to a diameter larger than the preforms. Since the molded product is sent out to the opposite side in the same state, the amount of movement of the inner split mold 11b is made large so as not to interfere with the sending in and out.

Therefore, as shown in Fig. 2, the opening amount of both split molds centered on parting line b! A distance difference arises between c+d. This distance difference between the mold opening positions does not pose any problem when opening and closing the mold, but when supplying labels to each half of the cavity using the pair of label holders 16 whose lateral movement is limited, , the distance difference becomes an obstacle, making it difficult to supply labels to the inner split mold flb, which has a large movement distance.

Therefore, in order to remove the distance difference and enable label supply by inserting the label holder 16, after the molded product is sent out, the inner split mold flb is moved in the mold closing direction to adjust its position. As a result, the distance e from the parting line b becomes equal to the distance C of the outer split mold 11a,
The labels 19 can be simultaneously supplied to both cavity surfaces by the label holder 16 without changing the label supply device.

Note that the label 19 is attached to the cavity surface using a normal suction means provided within the mold. In addition, although the label holder 16 is shown close to the mold in the drawing,
In reality, it is waiting at a remote location where it does not interfere with the delivery of molded products.

[Effects of the Invention] As described above, even if there is a distance difference between the open positions of the inner and outer split molds, the inner split mold can be moved in the mold closing direction before inserting the label holder. Since the mold opening positions of both split molds are adjusted equally around the parting line, labels can be smoothly supplied to both sides of the cavity by the pair of label holders, regardless of the distance difference. In addition, even if the mold opening amount of the inner split mold differs depending on the molding machine, it can be accommodated without changing the specifications of the label feeding device, making the label feeding device more versatile and reducing costs. It also has the advantage of being able to

[Brief explanation of drawings]

1 to 3 show an embodiment of the method for supplying labels to the cavity surface of a blow mold according to the present invention, and FIG. 1 shows a part of the inner split mold and a label supply device. 2 is a plan sectional view showing the blowing mold and label supply device when the mold is opened; FIG. 3 is a partial plan sectional view when the mold opening position is corrected; FIGS. The figure is an explanatory diagram of a process outline of a rotary injection stretch blow molding machine. 1...Blowing mold 1a...Outer split mold 1b...Inner split mold 2...Label feeding device 6... Label holder 8... Cavity half 9... Label

Claims (1)

[Claims] A parting line is set on the circular transfer line of the preform and molded product, and the mold opening amount of the split mold inside the circular transfer line is set to be larger than that of the split mold outside. , When inserting a holder from the side of the mold to supply labels, before inserting the holder, move the inner split mold in the mold closing direction so that the mold opening position of both split molds is aligned with the parting line. A method for supplying a label to a cavity surface of a blowing mold, characterized in that the holder is adjusted equally between the molds, and then the label is supplied to the cavity surface of a blow mold by inserting the holder between the molds.