The present invention regards a method for the injection molding of internally hollow parts. This method provides for the injection of a thermoplastic melt from an injection unit along a flow path in an inner space of a mold, then the injection of a fluid in the plastic material still at the softened state, in a manner such that the plastic material is pressed against the walls of the inner space of the mold, then the cooling of the plastic material until a rigid part is formed, and finally the removal of the part from the inner space of the mold.
Among the prior art patents, U.S. Pat. No. 6,713,014 describes a process which is deemed the closest technique. According to U.S. Pat. No. 6,713,014, in the step of injecting the softened thermoplastic material, the inner space of the mold is not completely filled; in addition, the fluid injected in the inner space is a liquid with high thermal capacity, while a portion of the still-softened plastic material is moved from the inner space of the mold to a separate secondary compartment. The flow of the thermoplastic material from the inner space of the mold into the secondary cavity is controlled by means of a valve which is closed and opened according to the established timing.
The forming of the cavity inside the part can be achieved with a fluid which can be water or a gas under pressure, preferably nitrogen.
Nevertheless, nitrogen, which constitutes air, involves expenses for its separation and for its maintenance at low temperature.
DE 19505633 describes a process for making hollow parts of thermoplastic material which provides for the injection of the melt in the inner space of a mold and the simultaneous or successive injection of a pressurized fluid through one or more nozzles. Following the cooling, the fluid is released through one or more pressure-release nozzles separated from the fluid-injection nozzles. The fluid, preferably nitrogen, can be collected in a container and reused.
One object of the present finding is to reduce the quantity of pressurized nitrogen to a minimum, in order to reduce the costs of injection molding assisted by pressurized gas.
The abovementioned object and still others are attained by means of a method for the injection molding of internally hollow parts according to that claimed in the enclosed claims.
The present invention will now be described as a non-limiting example with reference to the enclosed drawings, in which:
With reference to the figures, an apparatus is shown comprising a mold consisting of a matrix 1 and of a cooperating punch 2, both of which delimit inner space 3 which has the shape of the molded part indicated with P in
The method according to the invention comprises the injection in the inner space 3 (
For a description of the method according to the present invention ore detail, reference is made to
In this manner, the thermoplastic material, after having completely occupied the inner space 3, passes through the connecting duct 7, into the secondary compartment 8. Before this step finishes, the valve 6 is opened and pressurized nitrogen is made to flow through the supply pipe 5; such pressurized nitrogen in the inner space 3 pushes the material still in the softened state towards the walls of the inner space 3 and into the connecting duet 7 up to the compartment 8. This step, also called emptying, leads to the formation of the cavity 13 inside the part P being molded.
At the end of the emptying, as shown in
Subsequently, there is a washing step by means of opening the valve 12 for air. Due to this opening, pressurized air is made to flow into the cavity 13 of the part P being molded. The opening of the air valve 12 makes pressurized air A flow through the air duet 11 in the cavity 13 of the part being molded P, cooling it. The air passes through the perforation previously created by means of the perforating element 10 in step 4 and exits outside the mold by means of a channel 14 passing through the perforating element 10. It must be clear that a two-way valve could be provided that switches the supply of nitrogen and air.
At the end of the washing step, the air valve 12 is closed, while the valve 6 of the nitrogen is closed and the valve 9 of the connecting duct is opened.
The extraction of the molded part P is shown in side view in
The further finishing of the part P is not described.
It must be understood that the object of the invention is attained: the molding of internally hollow parts is enabled with considerable savings due to the combined use of pressurized air and nitrogen.
The protective scope of the invention is not limited to the preceding description, given only as an example, but is defined by the enclosed claims.
Number | Date | Country | Kind |
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102016000129409 | Dec 2016 | IT | national |
Filing Document | Filing Date | Country | Kind |
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PCT/IT2017/050006 | 12/19/2017 | WO | 00 |