JPH0452033Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a blow molding device, and more specifically, it relates to a blow molding device that uses a single-layer blow molding device that uses engineering plastics that have a high plasticizing temperature, or that uses the engineering plastics and general-purpose plastics. The present invention relates to a blow molding apparatus for multilayer blow molding using, for example.

[Conventional technology]

BACKGROUND ART Conventionally, blow molding apparatuses have been known in which the parison is conveyed by a stream of air at room temperature in order to extrude the parison along a cavity formed by a closed mold.

[The problem that the idea aims to solve]

In the conventional blow molding equipment mentioned above, the parison is conveyed to the cavity using air at room temperature, which lowers the temperature of the outer surface of the parison, and therefore, the temperature of the outer surface of the parison decreases. has the problem that blow molding cannot be performed.

The present invention attempts to solve these problems. That is, an object of the present invention is to provide a blow molding apparatus that can easily blow mold even plastics having a high plasticizing temperature.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a blow molding device that conveys the parison by an air flow to extrude the parison along a cavity formed by a closed mold. a heater that heats the gas to be heated, and a blower that sucks the gas through the cavity, and a cover is provided near the inlet and outlet of the gas to the mold. It was assumed that there was a

[Effect]

According to the present invention, since the heater is provided to heat the gas for conveying the parison to the cavity, the gas heated by the heater can be used for conveying the parison, and therefore, during extrusion of the parison, This prevents the temperature of the outer surface of the parison from decreasing, and even plastics with a high plasticizing temperature can be easily molded into thin and long molded products.

〔Example〕

1 and 2 show a first embodiment of the invention. FIG. 1 shows a state in which the parison is transported by a gas flow, and FIG. 2 shows a state in which blow molding is performed.

In Figure 1, 1 and 2 are molds, 2 and 4 are upper pinch parts, 5 and 6 are lower pinch parts, 7 is a cavity, 8 is a blower, 9 is a temperature controller, 10 is a head, and 11 is a parison. , 12 is the upper cover, 13
24 is a lower cover, and 24 is a heater.

That is, in FIG. 1, the molds 1 and 2 are closed,
Open the upper pinch parts 3 and 4, and open the lower pinch parts 5,
Gas such as air heated by the heater 24 is introduced into the cavity 7 formed when the blower 8 is opened.
suction to create a gas flow. From this state,
A parison 11 is extruded from the head 10. Heater 2
4 is a temperature controller to adjust the temperature of the gas. In addition, in order to prevent extreme intrusion of external cold gas into the cavity 7, an upper cover 12 and a lower cover 13 are provided.
is provided.

By doing so, gas heated to an appropriate temperature can be used to transport the parison 11.

In FIG. 2, when the parison 11 of a predetermined length is extruded, the blower 8 is stopped, the upper pinch parts 3, 4 and the lower pinch parts 5, 6 are closed, and air is supplied to the parison 11 from the air pin 14. Inhale and form.

FIG. 3 shows a second embodiment of the present invention.
Energy saving measures have been taken.

In FIG. 3, 15 is a heat storage tank, 16 is a movable piece, 17, 18, 19, 20, 21 are valves,
22 and 23 are position sensors.

That is, high-temperature gas discharged from the blower 8 is guided to the heat storage tank 15 partitioned by the movable piece 16 to save energy. That is, with valves 17 and 18 open and valves 19 and 20 closed, or with valves 17 and 18 closed and valves 19 and 20 open, high-temperature gas is alternately stored and discharged in heat storage tank 15. Movable piece 16 is valve 1
7 and 18 are open and valves 19 and 20 are closed,
If the signal from the position sensor 22 cannot be obtained after stopping the blower 8, the valve 21 is opened to restart the blower 8, and the blower 8 is stopped by the signal from the position sensor 22. In the reverse cycle, the position sensor 23 performs a similar operation.

[Effect of idea]

As explained above, according to the present invention, since the heater is provided to heat the gas for conveying the parison to the cavity, the gas heated by the heater can be used for conveying the parison. As a result, the temperature of the outer surface of the parison is prevented from decreasing during extrusion, and even plastics with a high plasticizing temperature can be easily molded into thin and long molded products. Moreover, since covers are provided near the inlet and outlet of the gas into the mold, extreme intrusion of external cold gas into the cavity is prevented.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view showing the first embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the device shown in FIG. 1, and FIG.
The figure is a sectional front view showing a second embodiment of the present invention. 1, 2...Mold, 7...Cavity, 8...Blower, 11...Parison, 12...Top cover,
13...lower cover, 24...heater.

Claims (1)

[Scope of utility model registration request] A blow molding device that conveys the parison using an air flow to extrude the parison along a cavity formed by a closed mold includes a heater that heats the gas that conveys the parison, and a heater that heats the gas that conveys the parison, and a heater that heats the gas that conveys the parison, and A blow molding apparatus, comprising a blower for sucking the gas through the mold, and a cover near an inlet and an outlet of the gas into the mold.