Molding unit for containers, equipped with a boxing insert with air circulation

Patent metadata

Field	Value
Publication number	US-2018022011-A1
Application number	US-201715655156-A
Country	US
Kind code	A1
Filing date	Jul 20, 2017
Priority date	Jul 21, 2016
Publication date	Jan 25, 2018
Grant date	—

Abstract

Molding unit ( 1 ) for the forming of a container ( 2 ) provided with a hollow recess ( 3 ), comprising:
a mold ( 5 ) provided with a lateral wall ( 6 ) defining a cavity ( 7 ) and provided with a pocket ( 9 ) that comes out into the cavity ( 7 ); a boxing device ( 11 ) comprising:
an insert ( 12 ) mounted in translation in the pocket ( 9 ) relative to the lateral wall ( 6 ) and provided with at least one passage ( 81 ) opening out; an actuator ( 16 ) integral with the insert ( 12 ) and provided with a piston ( 17 ) mounted in a chamber ( 22 ) defined in the wall ( 6 ) of the mold ( 5 ), the piston ( 17 ) subdividing the chamber ( 22 ) into a rear half-chamber ( 22 A) in communication with a primary fluid duct ( 46 ), and a front half-chamber ( 22 B) in communication, on the one hand, with a secondary fluid duct ( 50 ) and, on the other hand, with the pocket ( 9 ).

First claim

1 . Molding unit ( 1 ) for the forming of a container ( 2 ) provided with a hollow recess ( 3 ) toward the interior of the container ( 2 ), this forming unit ( 1 ) comprising:
a mold ( 5 ) provided with a lateral wall ( 6 ) defining a cavity ( 7 ) having the impression of at least one portion of the container ( 2 ) and that extends along a main axis (X) defining a vertical direction, this lateral wall ( 6 ) being provided with a pocket ( 9 ) that comes out into the cavity ( 7 ); a boxing device ( 11 ) comprising:
an insert ( 12 ) mounted in translation relative to the lateral wall ( 6 ) along a transverse axis (T) defining a radial direction, between a retracted position in which the insert ( 12 ) is at least partially retracted in the pocket ( 9 ), and a deployed position in which the insert ( 12 ) projects at least partially into the cavity ( 7 ) outside of the pocket ( 9 ),
an actuator ( 16 ) integral with the insert ( 12 ) and provided with a piston ( 17 ) mounted in translation along the transverse axis (T):
wherein: the insert ( 12 ) is provided with at least one passage ( 81 ) that extends from one rear end ( 82 ), by which it opens into the pocket ( 9 ), to a front end ( 83 ) by which it opens onto a front face ( 13 ) of the insert ( 12 ); the piston ( 17 ) is mounted in a chamber ( 22 ) defined in the wall ( 6 ) of the mold ( 5 ), the piston ( 17 ) subdividing the chamber ( 22 ) into a rear half-chamber ( 22 A) in communication with a primary fluid duct ( 46 ), and a front half-chamber ( 22 B), in communication with both a secondary fluid duct ( 50 ), as well as the pocket ( 9 ).

2 . Molding unit ( 1 ) according to claim 1 , wherein the (or each) passage ( 81 ) is drilled in the body of the insert ( 12 ).

3 . Molding unit ( 1 ) according to claim 1 , wherein:
the lateral wall ( 6 ) of the mold ( 5 ) comprises a partition ( 42 ) that separates the chamber ( 22 ) from the pocket ( 9 ), this partition ( 42 ) being drilled with a hole ( 43 ); the actuator ( 16 ) comprises a rod ( 34 ) mounted in translation in this hole ( 43 ) and on which the insert ( 12 ) is fastened; a gap ( 85 ) is located between the rod ( 34 ) and the hole ( 43 ) to make possible the fluid communication between the front half-chamber ( 22 B) and the pocket ( 9 ).

4 . Molding unit ( 1 ) according to claim 3 , wherein the rod ( 34 ) is grooved.

5 . Molding unit ( 1 ) according to claim 1 , wherein the insert ( 12 ) is provided with a plurality of passages ( 81 ).

6 . Molding unit ( 1 ) according to claim 1 , wherein the or each passage ( 81 ) opens, by its rear end ( 82 ), onto a rear face ( 37 ) of the insert ( 12 ).

7 . Molding unit ( 1 ) according to claim 1 , wherein the chamber ( 22 ) is formed by an added sleeve ( 14 ), mounted in a complementary recess ( 15 ) made in the lateral wall ( 6 ) and attached to it, and in which the piston ( 17 ) is mounted in translation.

8 . Molding unit ( 1 ) according to claim 1 , wherein the rear half-chamber ( 22 A) is connected to a fluid source having a high pressure, and the front half-chamber ( 22 B) to a fluid source having a comparatively lower pressure.

9 . Molding unit ( 1 ) according to claim 8 , wherein the high pressure is greater than 20 bars, and the lower pressure is less than or equal to 12 bars.

10 . Method for using a molding unit ( 1 ) according to claim 1 , which comprises the following operations:
introduction of a blank into the mold ( 5 ) with the insert ( 12 ) in retracted position; injection, into the blank, of a pressurized fluid; injection of a fluid at high pressure into the rear half-chamber ( 22 A) to move the insert toward its deployed position; after a time lag, injection of a fluid at relatively lower pressure into the front half-chamber ( 22 B) while keeping the rear half-chamber ( 22 A) pressurized; depressurization of the formed container ( 2 ); depressurization of the rear half-chamber ( 22 A) while keeping the front half-chamber ( 22 B) pressurized; depressurization of the front half-chamber ( 22 B).

11 . Molding unit ( 1 ) according to claim 2 , wherein:
the lateral wall ( 6 ) of the mold ( 5 ) comprises a partition ( 42 ) that separates the chamber ( 22 ) from the pocket ( 9 ), this partition ( 42 ) being drilled with a hole ( 43 ); the actuator ( 16 ) comprises a rod ( 34 ) mounted in translation in this hole ( 43 ) and on which the insert ( 12 ) is fastened; a gap ( 85 ) is located between the rod ( 34 ) and the hole ( 43 ) to make possible the fluid communication between the front half-chamber ( 22 B) and the pocket ( 9 ).

12 . Molding unit ( 1 ) according to claim 2 , wherein the insert ( 12 ) is provided with a plurality of passages ( 81 ).

13 . Molding unit ( 1 ) according to claim 3 , wherein the insert ( 12 ) is provided with a plurality of passages ( 81 ).

14 . Molding unit ( 1 ) according to claim 4 , wherein the insert ( 12 ) is provided with a plurality of passages ( 81 ).

15 . Molding unit ( 1 ) according to claim 2 , wherein the or each passage ( 81 ) opens, by its rear end ( 82 ), onto a rear face ( 37 ) of the insert ( 12 ).

16 . Molding unit ( 1 ) according to claim 3 , wherein the or each passage ( 81 ) opens, by its rear end ( 82 ), onto a rear face ( 37 ) of the insert ( 12 ).

17 . Molding unit ( 1 ) according to claim 4 , wherein the or each passage ( 81 ) opens, by its rear end ( 82 ), onto a rear face ( 37 ) of the insert ( 12 ).

18 . Molding unit ( 1 ) according to claim 5 , wherein the or each passage ( 81 ) opens, by its rear end ( 82 ), onto a rear face ( 37 ) of the insert ( 12 ).

19 . Molding unit ( 1 ) according to claim 2 , wherein the chamber ( 22 ) is formed by an added sleeve ( 14 ), mounted in a complementary recess ( 15 ) made in the lateral wall ( 6 ) and attached to it, and in which the piston ( 17 ) is mounted in translation.

20 . Molding unit ( 1 ) according to claim 3 , wherein the chamber ( 22 ) is formed by an added sleeve ( 14 ), mounted in a complementary recess ( 15 ) made in the lateral wall ( 6 ) and attached to it, and in which the piston ( 17 ) is mounted in translation.

Assignees

• Sidel Participations

Inventors

• Derrien Mikael
• Penet Laurent

Classifications

• B29C49/4823

  with incorporated heating or cooling means · CPC title

• B29C2049/4807

  by movable mould parts in the mould halves · CPC title

• B29K2067/003

  PET, i.e. poylethylene terephthalate · CPC title

• B29C2049/4861

  Neck portions of bottle producing moulds · CPC title

• B29C2049/483

  in different areas of the mould at different temperatures, e.g. neck, shoulder or bottom · CPC title