JPS60180810A - Regulator for parison lowering speed in plural parisons - Google Patents

Abstract

PURPOSE:To equalize the lowering speeds of plural parisons coming out of the parison with plural outlets by providing a simple structure capable of easily altering the cross sections of each flow path to the plural outlets of the parison head. CONSTITUTION:To equalize the lowering speeds of a parison 4 to be extruded from each outlet, a filter 29 attached to the downside of a tapered part 19 is removed out, a tool of a square cross section is inserted into the central hole 28 and coupled with the squre hole 27 of a stopper 26, the stopper 26 is turned and reciprocally moved by means of the screw, and the opening of the outlet of the pipe part 25 is altered for regulation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the rate of descent of parinone in multiple parisons used in a molding machine for forming synthetic containers from ciparison by blow molding.

The synthetic material melted and extruded by one extruder is branched to flow out into multiple parisons, and multiple containers of the synthetic material are simultaneously blow molded using a mold and mandrel with multiple cavities corresponding to each parison. In a molding machine that controls the mold and mandrel at the same time, it is necessary that the parisons flowing out have the same descending speed and that parisons of equal and constant length are supplied to the mold. If the descending speeds are unequal, the parison that descends at the slowest speed will limit production, while the parison that descends faster will waste excess material and result in better quality product. I can't do it.

The object of the present invention is to meet this need, and by providing a simple structure in which the cross-sectional area of the flow path can be easily changed at each of the plurality of outlets of the parison head, it is possible to save materials and improve production. An object of the present invention is to provide a parison lowering speed adjusting device for a plurality of parisons. Hereinafter, an embodiment of the present shouting will be described with reference to the drawings.

In FIG. 1, the configuration of a molding machine is shown.

When the granular synthetic material is charged into the hopper of the extrusion device (1) of the molding machine, it is heated and melted and pushed into the parison head (2). The parison head (2) is provided with a plurality of outlet portions (3) having the same shape in the direction perpendicular to the plane of the paper, and the dissolved synthetic substance is branched and supplied to the outlet portion (3). ) is formed into a cylindrical pariso/(4). The parison (4) extruded to a certain length is held in the mold (5) and the lower end is sealed.
When the upper part is cut with the cutter (6), the mandrel head (
Force is moved downwards. A blowing mandrel (8) descends from the mandrel head (7) and is inserted through the upper opening of the parison (4) to airtightly sandwich the parison (4) between it and the upper part of the mold (5) (51). supply/discharge port (9
When compressed air is supplied from ) to the blowing mandrel (8) and blown into the parison (4) from its tip, the parison (4) is molded into a container α0) along the inner shape of the mold (5). Subsequently, the filling mandrel αB, which is installed concentrically with the blowing mandrel (8), descends into the container 00). A predetermined amount of filling material is pushed out from the tank Q21 by the measuring cylinder device α3), supplied to the filling mandrel αυ via the hose α(a), and injected into the container (10).

The air in the container aQ escapes from the supply/discharge port (9), and when the injection is finished, the filling mandrel αυ and the blowing mandrel (8) rise. Subsequently, the opening of the container (10) is sealed with a closure device Q51, and when the mold +5) (5) is opened, the product is taken out. Mold (5) (5) and mandrel head (
7) etc. are provided in parallel corresponding to each outlet part (3),
As described above, each step is carried out under simultaneous control.

FIG. 2 shows the structure of one outlet (3) provided in the parison head (2). An annular passage (171) for the dissolved synthetic substance is provided in the vertical hole of the main body (16), and an inner cylinder α barrel is attached to it.The lower part of the inner cylinder α mallet has a small diameter; A continuous passage (17a) is provided between the tapered member (1 part is fixed and the passage a7 between the tapered member and the outer periphery of the tapered member) that expands downward continuously, and the opposing outer cylinder (a) is connected to the bolt. (21) is attached to the elevating member (2). The elevating member Qz is fit into the lower part of the hole in the main body aO where the inner cylinder α mark is attached, so that it can be raised and lowered freely, and it is connected to the small diameter part of the inner cylinder α8. They form an extension of the passage αD and face each other.The elevating member Q is guided by the upper surface of the main body (161) via a rod (C), etc., and slides in a direction perpendicular to the plane of the paper.
is engaged in. The lifting member (2) moves up and down due to the inclination of the retaining part of the cam member (2 (A)) as it slides, and the width of the passage (17a) between the tapered member α and the outer cylinder (20) is adjusted. , the thickness of the parison (4) extruded from here can be changed.The cam member (2) is long in the direction perpendicular to the plane of the drawing, and is used to raise and lower each elevating member of the plurality of outlet portions (3) provided in parallel motion in the same direction. (c), the thickness of a plurality of parisons (4) can be adjusted uniformly at the same time. A pipe member (251) is connected to the upper part of the passage (lη), and the extrusion device (
1) (Fig. 1). A lower part of a plug member which is slidably moved forward and backward toward the opening of the pipe member (c) and adjusts its opening degree is screwed into the center hole in the vertical direction of the inner cylindrical branch. A center hole (26a) is provided in the lower half of the plug member (261), and the opening is provided with a square hole (2η) into which a tool (not shown) is inserted, making it easier to turn the plug member (2F5). The center hole of the member (19) is the center hole of the plug member (
In connection with 26a), a filter pane for removing dust from the air is attached to the lower opening of the center hole.

An air supply port (to) for compressed air is provided on the side surface of the body α0 where the inner cylinder (18) is installed, and the air supply port (30) passes through the inner cylinder (08) to the outer periphery of the plug member (20). center hole (26
An air passage communicating with the center hole (mark 2) is provided through a).A heater (3I) is provided in the main part of the structure outside the passages (17) and (17a), and the passage αη and (17a) is used to heat the molten synthetic material extruded through it in order to impart appropriate flexibility.

Next, we will discuss the effect. Extrusion device (1) shown in Figure 1
The synthetic substance heated and melted in the parison head (2) is branched and supplied to each outlet (3), and passes through the passages αη and (17a), which are annular in plan view, into the cylindrical parison ( 4). Compressed air supplied from the air supply port (to) is blown into the hollow part of the parison (4) from the center hole (281) of the taper member (1) through the filter (2ω) to prevent deformation of the parison (4). Exit part (3
) To adjust the descending speed of the parison (4) pushed out from
), insert a tool (not shown) with a rectangular cross section to engage the plug member (2G square hole (2'0), turn the plug member (26) to move it forward and backward through the engaged screw, Pipe member (2
Adjust by changing the opening of the two outlet openings. By adjusting the opening degree, the descending speed of each parison (4) can be made equal.

As is clear from the above description, according to the present invention, by making the descending speed of a plurality of parisons that flow out from a parison head having a plurality of outlet portions the same, it is possible to prevent hindrance to subsequent processes or material loss. It has great practical effects and advantages, such as not only being able to prevent waste, but also being able to adjust the descending speed to the optimum speed depending on the product being handled, thereby improving production.

-4. Brief explanation of the drawings' Figures 1 (a) and (b) are explanatory diagrams of the structure and operation of a molding machine having a parison head provided with an embodiment, and Figure 2 is a parison head showing an embodiment. FIG.

1 is an extrusion device, 2 is a parison head, 3 is an outlet portion, 4
is a parison, 5 is a mold, 6 is a cutter, 7 is a mandrel head, 8 is a blowing mandrel, 9 is a supply/discharge port, 10 is a container, 11 is a filling mandrel, 12 is a tank, 13 is a measuring cylinder device, 14 is a hose, 15 is an occluder, 16
is the main body, 17 is the passage, 17a is the passage, 18 is the inner cylinder, 19
20 is an outer cylinder, 21 is a bolt, 22 is an elevating member, 23 is a rod, 24 is a cam member, and 25 is a nozzle.

26 is a plug member, 27 is a square hole, 28 is a center hole, 2
9 is a filter, 30 is an air supply port, and 31 is a heater.

Patent applicant: Representative of Aida Engineering Co., Ltd. (11) Figure 2

Claims (1)

[Claims] At the outlet of each parison of a molding machine that simultaneously molds the melted synthetic material into multiple parisons and simultaneously blow-forms them into a container, an annular hole in which the melted synthetic material flows into the vertical hole of the main body is used. A pipe that is provided with an inner cylinder α mallet forming a passage, is slidably fitted into a center hole of the inner cylinder, and is rotatably screwed into a thread at the bottom of the center hole, and connected to the upper part of the passage. A parison descending speed adjusting device for a plurality of parisons, characterized in that a plug member is provided that advances and retreats toward the opening of the member to adjust the degree of opening.