JPS629923A - Molding method making use of lap producing mold and nozzle device therefor - Google Patents

Abstract

PURPOSE:To make production cost low and to facilitate an operation manipulation without making a mounting area of a molding machine large, by a method wherein injection nozzles whose lengths are different from each other are arranged on a T die, a plasticized material is injected through the injection nozzle and a cavity is filled with the material at one action by making nozzle touch the cavity. CONSTITUTION:The total four sets of the same molds, the set of which is composed of a male and female molds 5, 4 are placed on both sides of an intermediate movable platen 1, hot runners 17 provided on hot runner manifolds 2, 3 are ramified into T-shaped runners 7 by traversing the hot runners 17 longitudinally, a synthetic resin plasticized material is injected to each cavity 6 and the cavity 6 is filled with the same at one action by interposing a tip 8 and performing nozzle touching. As for a T die C of the tip of a barrel 9, a long and short nozzles 10, 11 are screwed to the T die C in the vertical direction of the same at fixed intervals, moved forward toward a mold clamping device along an arrow 12 and nozzle touching 13, 13' are performed. At the time of release of mold clamping, a ram 14 is moved backward up to a predetermined position along the arrow 12 at a fixed stroke and a molded article is unloaded by making the mold clamping device (a) release. When mold clamping is performed again, a molding cycle is repeated by a method wherein the nozzle touching, injection, dwell pressure application and backward movement are performed by advancing the ram 14.

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, a molding machine using this method (an injection unit with a double-headed nozzle shown by the chain line in Figure 1) was published in Japanese Patent Publication No. 49-4067, but the overall shape of the molding machine was single-shaped. This resulted in an extremely large loss, and there were also shortcomings in terms of maintenance and management. That is, for a four-stage mold clamping system, an injection unit having a double-headed nozzle must touch the side surface of the mold clamping device orthogonally. For this reason, C2 is longer because the mold clamping device uses a four-stage mold, and since the nozzle touches the injection unit in a perpendicular shape, it is also longer like the mold clamp, and the installation floor space of the molding machine is 2 times that of the conventional machine.
However, the present invention not only solves the above-mentioned drawback, but also has low manufacturing cost and easy operation. In addition, since the injection unit can move back and forth in a straight line in the mold clamping direction and touch the nozzle, manufacturing cost and operation are easy.

Examples will be described in detail below with reference to the drawings.

a is a mold clamping device, b is an injection unit, 1 is an intermediate movable platen, 2
, 3 indicate hot runner manifolds, and movable plates 15 and 16 having the hot runner manifolds 2 and 3 are arranged on the left and right sides of the intermediate movable plate 1. On the left and right sides of the intermediate movable platen 1, as shown in the figure, there are a total of 4 sets of 5 male molds and 4 female molds of the same mold on the left and right sides, and the hot runner 17 provided in the hot runner manifold 2.3 runs vertically and branches into a T-shape 7. Then, by touching the chip 8 with the intervening nozzle, the cavities 6.6, 6.6 are injected and filled with the plasticized material all at once. The injection unit) b stores the plasticized material at the tip of the screw by rotating the screw 9 shown by the chain line inside the barrel 9, and retracts the screw 9' with a constant back pressure, so that a certain amount of the plasticized material is deposited at the tip of the screw. (conventional in-line screw one-way type).

A nozzle 10 and a small nozzle 11 are screwed onto the T-die C at the tip of the barrel 9 at regular intervals in the vertical direction,
Touch the nozzle to the mold clamping device as shown. The nozzle moves forward along arrow 12 and touches 13.13. When the mold clamp is opened, the hydraulic cylinder at the rear end of the mold clamp device a (not shown)
Then, the mold clamping ram 14 moves at a constant stroke in the direction of arrow 12 and retreats to a predetermined position, and the mold clamping device a is opened to take out the molded product. When the mold clamping is performed again, the ram 14 can be used for molded products of the same wall thickness or unequal wall thickness, as well as quadruple stacking of cavities. preferable. The reason for this is that the more uniformly thick the product is, the faster the mold cycle can be formed.

The features of the present invention are: 1. Installation area is small.

2. The die of the injection unit is a fraction of the cost of conventional ones.

3. Easy maintenance and management of molding operations.

4. If the conventional machine is set as 1, a production advantage of about 3.7 times can be obtained.

5. The molded product has no nozzle marks and does not require finishing.

As described above, high-efficiency molding, which has not been previously possible compared to the size of the molding machine, becomes possible.

[Brief explanation of drawings]

No. 11'71 showing an embodiment of the present invention is a plan view showing the overall appearance of a molding machine, and the injection unit having a double-headed nozzle indicated by diagonal lines on the side is a conventional embodiment.

Claims (2)

[Claims] (1) The T-die is equipped with multiple nozzles of different lengths, and a movable platen with hot runner manifolds corresponding to the number of nozzles can be opened and closed via tie bars, and the movable platen has the same number of injection nozzles. A nozzle touch recess is provided, from which the hot runner runs vertically to the mold clamping center, and then branched into a T-shape, opening the spool into the mold cavities on both sides through the tip, dividing one injection unit into the tip die. Molding using an overlapping mold with two long and short nozzles arranged and screwed together with two long and short nozzles, and the injection unit stacks a fixed amount of plasticized material at once and injects it into the cavity of the mold. Law. (2) A nozzle device in which the same number of hot runner manifolds are disposed in a plurality of overlapping molds, and an injection unit having two long and short nozzles at the tip end of the injection unit is disposed facing the hot runner manifold.