Molding unit for blow molding containers, equipped with a guiding wear ring

Patent metadata

Field	Value
Publication number	US-10322539-B2
Application number	US-201515508136-A
Country	US
Kind code	B2
Filing date	Jul 8, 2015
Priority date	Sep 4, 2014
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

A molding unit ( 1 ) for blow molding a container from a parison, the container including a wall portion and a base, the molding unit ( 1 ) including:
a mold sidewall ( 2 ) extending along a main axis (X) and having an inner molding surface ( 3 ) defining a counter print of the wall portion of the container, and an opening ( 8 ) at a lower end of the inner molding surface ( 3 ), a cylinder jacket ( 10 ) fixed to the mold sidewall ( 2 ) and extending axially below the opening ( 8 ); a movable mold base ( 14 ) having a cylindrical bracket ( 17 ) slidingly received within the cylinder jacket ( 10 ) and a body ( 15 ) axially protruding from the bracket ( 17 ), a wear ring ( 33 ) fixed to the mold base ( 14 ), the wear ring ( 33 ) including a cylindrical guiding bushing ( 34 ) interposed between the bracket ( 17 ) and the cylinder jacket ( 10 ).

First claim

The invention claimed is:

1. A molding unit ( 1 ) for blow molding a container from a parison, said container comprising a wall portion and a bottom, said molding unit ( 1 ) comprising:
a mold sidewall ( 2 ) extending along a main axis (X) and having an inner molding surface ( 3 ) defining a counter print of the wall portion of the container, and an opening ( 8 ) at a lower end of the inner molding surface ( 3 ),
a cylinder jacket ( 10 ) fixed to the mold sidewall ( 2 ) and extending axially below the opening ( 8 );
a mold base ( 14 ) having a cylindrical bracket ( 17 ) slidingly received within the cylinder jacket ( 10 ) and a body ( 15 ) axially protruding from the bracket ( 17 ) and having an upper surface ( 16 ) defining a counter print of the container bottom, said mold base ( 14 ) being axially movable with respect of the mold sidewall ( 2 ) between a retracted position in which the upper surface ( 16 ) is offset with respect of the opening ( 8 ), and a raised position in which the upper surface ( 16 ) closes the opening ( 8 ),
the molding unit ( 1 ) further comprising a wear ring ( 33 ) fixed to the mold base ( 14 ), said wear ring ( 33 ) including a cylindrical guiding bushing ( 34 ) interposed between the bracket ( 17 ) and the cylinder jacket ( 10 ).

2. A molding unit ( 1 ) according to claim 1 , wherein the wear ring ( 33 ) includes a flange ( 35 ) which radially protrudes from the guiding bushing ( 34 ) and by which the wear ring ( 33 ) is fixed to the bracket ( 17 ).

3. A molding unit ( 1 ) according to claim 2 , wherein the flange ( 35 ) is integrally formed with the guiding bushing ( 34 ).

4. A molding unit ( 1 ) according to claim 2 , wherein the wear ring ( 33 ) is fixed to the bracket ( 17 ) by means of screws ( 36 ).

5. A molding unit ( 1 ) according to claim 1 , wherein the wear ring ( 33 ) is made of a self-lubricating material.

6. A molding unit ( 1 ) according to claim 5 , wherein the wear ring ( 33 ) is made of an oil-impregnated metal.

7. A molding unit ( 1 ) according to claim 6 , wherein said metal is bronze.

8. A molding unit ( 1 ) according to claim 1 , wherein the cylinder jacket ( 10 ) is fixed to the mold sidewall ( 2 ) by means of screws ( 13 ).

9. A molding unit ( 1 ) according to claim 1 , comprising a pair of half molds ( 2 A, 2 B) each defining half the mold sidewall ( 2 ), wherein the half molds ( 2 A, 2 B) are movable with respect to each other, between an open position in which the half molds ( 2 A, 2 B) are spaced from each other and a closed position in which the half molds ( 2 A, 2 B) are in contact with each other to form together the whole counter print of the container wall portion.

10. A molding unit ( 1 ) according to claim 9 , wherein the cylinder jacket ( 10 ) is formed of a pair of half jackets ( 10 A, 10 B) each fixed to a respective half mold ( 2 A, 2 B).

11. A molding unit ( 1 ) according to claim 10 , wherein each half jacket ( 10 B, 10 A) has a front edge ( 41 ) which, in the closed position of the half molds ( 2 A, 2 B), protrudes from a parting plane (P) defined between the half molds ( 2 A, 2 B), towards the other half mold ( 10 A, 10 B) and a diametrically opposite back edge ( 42 ) which stands back from the parting plane (P), and wherein, in the closed position of the half molds ( 2 A, 2 B), the front edge ( 41 ) of each half jacket ( 10 B, 10 A) abuts against the back edge of the other half jacket ( 10 A, 10 B).

12. A molding unit ( 1 ) according to claim 11 , wherein the front edge ( 41 ) extends on an angular aperture A, measured from the parting plane P in the closed position, comprised between 7° and 12°.

13. A molding unit ( 1 ) according to claim 11 , wherein the protruding front edge ( 41 ) of each half jacket ( 10 A, 10 B) has an inner chamfer ( 43 ).

14. A molding unit ( 1 ) according to claim 13 , wherein the inner chamfer ( 43 ) forms with a plane perpendicular to the parting plane (P) an angle (B) comprised between 10° and 20°.

15. A molding unit ( 1 ) according to claim 3 , wherein the wear ring ( 33 ) is fixed to the bracket ( 17 ) by means of screws ( 36 ).

16. A molding unit ( 1 ) according to claim 2 , wherein the wear ring ( 33 ) is made of a self-lubricating material.

17. A molding unit ( 1 ) according to claim 3 , wherein the wear ring ( 33 ) is made of a self-lubricating material.

18. A molding unit ( 1 ) according to claim 4 , wherein the wear ring ( 33 ) is made of a self-lubricating material.

19. A molding unit ( 1 ) according to claim 2 , wherein the cylinder jacket ( 10 ) is fixed to the mold sidewall ( 2 ) by means of screws ( 13 ).

20. A molding unit ( 1 ) according to claim 3 , wherein the cylinder jacket ( 10 ) is fixed to the mold sidewall ( 2 ) by means of screws ( 13 ).

Assignees

• Sidel Participations

Inventors

• Breard Mathieu
• Bourdel Yves
• Leroux Marc
• Barbey Arnaud

Classifications

• B29C49/06

  Injection blow-moulding · CPC title

• B29K2859/00

  Use of polyacetals, e.g. POM, i.e. polyoxymethylene, or derivatives thereof as mould material · CPC title

• B29C2049/4892

  Mould halves consisting of an independent main and bottom part · CPC title

• B29C49/18

  using several blowing steps (B29C49/16 takes precedence) · CPC title

• B29C49/4236

  Drive means · CPC title