Mold structure of product with zero mold stripping angle in appearance and plastic product production equipment

Abstract

The utility model provides a mold structure of a product with zero mold stripping angle in appearance and plastic product production equipment. The mold structure of the product with zero mold stripping angle in appearance comprises an ejector plate, a movable mold blank, an inclined ejector and a fixed mold assembly, the movable mold blank is movably connected with the ejector plate, the movable mold blank can move in the direction close to or away from the ejector plate, an inclined driving part and a boss are arranged on the movable mold blank, and the inclined ejector is rotationally arranged on the ejector plate and movably matched with the inclined driving part. Compared with the prior art, according to the mold structure of the product with the zero demolding angle in appearance, when the product is demolded, the inclined ejector ejects the product in the profiled groove, so that the product is left on the fixed mold blank, then the product shrinks due to the material characteristics of the product, the product can be separated from the profiled groove, and then the product can be taken out of the profiled groove; and when the fixed mold blank is separated from the fixed mold assembly, the inclined top can move horizontally relative to the product so as to be separated from the back-off characteristic of the product, so that the fixed mold blank is smoothly separated from the product.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to a mold structure for products with zero ejection angle and a plastic product manufacturing equipment. Background Technology

[0002] In conventional mold design, the product remains on the boss of the rear mold when the mold is opened. The ejection mechanism of the rear mold ejects the product and removes it smoothly. The appearance of the product's side needs to be made with a corresponding ejection angle of about 1-5° according to the requirements, so that when the rear mold and the front mold separate, the front mold will not cause the product to fall off due to insufficient ejection angle.

[0003] With increasingly stringent requirements for product appearance design, the mold release angle of the product surface needs to be zero, and the surface needs to be textured. If the mold structure of the current product with zero mold release angle is used, it is easy for the front mold to be unable to separate from the product, or even for the product to stick to the front mold, making injection molding impossible. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies in the existing technology and to provide a mold structure for products with zero ejection angle and a plastic product production equipment.

[0005] One embodiment of this utility model provides a mold structure for a product with zero ejection angle, including: an ejector plate, a moving mold blank, an angled ejector, and a fixed mold assembly;

[0006] The moving mold blank and the ejector plate are movably connected. The moving mold blank can move towards or away from the ejector plate. The moving mold blank is provided with an inclined drive part and a boss. The inclined ejector is rotatably disposed on the ejector plate and is movably engaged with the inclined drive part.

[0007] The mold assembly is provided with a molding groove;

[0008] When the fixed mold assembly and the moving mold blank are closed, the boss extends into the groove, and the boss, the inclined top and the groove surround to form a mold cavity. The inclined top is provided with a forming part for forming the undercut feature of the product, and the forming part is located inside the mold cavity.

[0009] The moving mold blank can be moved relative to the fixed mold assembly from the mold closing position to the mold opening position and then to the mold opening position in a direction away from the fixed mold assembly.

[0010] When the moving mold blank moves from the mold closing position to the first position, the tilting drive unit drives the tilting top to move in a direction that is not parallel to the mold opening direction, so that the forming part disengages from the undercut feature of the product;

[0011] When the moving mold blank moves from the first position to the mold opening position, the moving mold blank, the ejector plate, and the inclined ejector move together in the mold opening direction.

[0012] In some optional embodiments, the fixed mold assembly includes a fixed mold blank, a fixed mold panel, and a fixed mold insert. The fixed mold blank is movably fitted with the fixed mold panel. The fixed mold assembly is movable in a direction close to or away from the fixed mold panel. The fixed mold blank is provided with a plurality of movable limiting members. The fixed mold insert is fixed on the fixed mold panel and surrounds the fixed mold blank to form the groove.

[0013] The moving mold blank can be moved relative to the fixed mold panel from the mold closing position to the mold opening position, the first position, and the mold opening position in sequence in the mold opening direction away from the fixed mold panel;

[0014] When the moving mold blank moves from the mold closing position to the second position, the fixed mold blank, the moving mold blank, the ejector plate, and the inclined ejector move together in the mold opening direction;

[0015] When the moving mold blank reaches the second position, the movable limiting member cooperates with the fixed mold panel to limit the movement of the fixed mold blank toward the mold opening direction.

[0016] In some optional embodiments, the fixed mold panel is provided with a plurality of limiting slide grooves, and the movable limiting member is movably engaged with the limiting slide grooves;

[0017] When the moving mold blank moves from the mold closing position to the second position, the movable limiting member moves relative to the limiting slide groove. When the moving mold blank reaches the second position, the movable limiting member engages with the inner wall of the limiting slide groove.

[0018] In some alternative embodiments, the movable limiting element is a plug screw, which is threaded into the fixed mold blank and movably engages with the limiting groove.

[0019] In some alternative embodiments, when the moving mold blank reaches the second position, the distance between the fixed mold blank and the fixed mold panel is 10 mm to 20 mm.

[0020] In some alternative embodiments, the tilting drive is an tilted through hole provided on the moving mold blank, the tilting ejector is movably inserted through the tilted through hole, and the extending direction of the tilted through hole is not parallel to the mold opening direction.

[0021] In some optional embodiments, the fixed mold assembly is provided with a locking mechanism. When the moving mold blank moves from the mold closing position to the first position, the locking mechanism locks with the ejector plate. When the moving mold blank moves from the first position to the mold opening position, the locking mechanism releases its locking with the ejector plate.

[0022] In some alternative embodiments, a pusher block is provided on the ejector plate;

[0023] When the moving mold blank is in the mold closing position, the push block is arranged on the inner wall of the mold cavity;

[0024] When the moving mold blank moves from the mold closing position to the first position, the push block abuts against the product located inside the mold cavity;

[0025] When the moving mold blank moves from the first position to the mold opening position, the push block moves with the ejector plate in the mold opening direction to disengage the push block from the product.

[0026] In some optional embodiments, the mold assembly is provided with a mold slider and a slider drive module;

[0027] When the moving mold blank is in the mold closing position, the fixed mold slider is arranged on the inner wall of the mold cavity;

[0028] When the moving mold blank moves from the mold closing position to the first position, the fixed mold slider moves away from the product under the drive of the slider drive module.

[0029] Another embodiment of this utility model provides a plastic product manufacturing equipment, including: a mold structure for a product with zero ejection angle as described above.

[0030] Compared to existing technologies, the mold structure of this utility model for products with zero ejection angle allows the inclined ejector to press the product into the mold groove during demolding, keeping the product on the fixed mold blank. Subsequently, the product shrinks due to its own material properties, allowing it to detach from the mold groove. The product can then be removed from the mold groove. Furthermore, when the fixed mold blank detaches from the fixed mold assembly, the inclined ejector can move relative to the product to disengage from the product's undercut feature, enabling the fixed mold blank to separate smoothly from the product.

[0031] To provide a clearer understanding of this invention, the specific embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0032] Figure 1 This is a structural diagram of a product in the background art;

[0033] Figure 2 A cross-sectional view of the mold structure of a product with zero ejection angle according to an embodiment of the present invention, when the moving mold blank is in the mold-closed position;

[0034] Figure 3 A cross-sectional view of the mold structure of a product with zero ejection angle according to an embodiment of the present invention when the moving mold blank moves to the first position;

[0035] Figure 4 This is a cross-sectional view of the mold structure of a product with zero ejection angle according to an embodiment of the present invention, when the moving mold blank moves to the mold opening position;

[0036] Figure 5 A cross-sectional view of the mold structure of a product with zero ejection angle according to an embodiment of the present invention when the moving mold blank moves to the second position;

[0037] Figure 6 This is a cross-sectional view of the mold structure of a product with zero ejection angle according to an embodiment of the present invention, under exploded conditions.

[0038] Explanation of reference numerals in the attached figures:

[0039] 10. Ejector plate; 11. Push block; 20. Moving mold blank; 21. Tilting drive unit; 22. Boss; 30. Angled ejector; 31. Forming part; 40. Fixed mold assembly; 41. Slot; 42. Fixed mold blank; 421. Movable limiting component; 43. Fixed mold panel; 431. Limiting slide; 44. Fixed mold insert; 45. Locking mechanism; 46. Fixed mold slider; 47. Slider drive module; 50. Product; 51. Undercut feature; Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, unless otherwise stated, "a plurality of" means two or more, and "a number" means one or more. In addition, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] In the description of this utility model, references to terms such as "one embodiment," "some alternative implementations," or "some optional embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Please see Figures 2 to 4 One embodiment of this utility model provides a mold structure for a product with zero ejection angle, including: an ejector plate 10, a moving mold blank 20, an inclined ejector 30, and a fixed mold assembly 40.

[0045] The moving mold blank 20 and the ejector plate 10 are movably connected. The moving mold blank 20 can move in the direction of approaching or away from the ejector plate 10. The moving mold blank 20 is provided with an inclined drive part 21 and a boss 22. The inclined ejector 30 is rotatably provided on the ejector plate 10 and is movably engaged with the inclined drive part 21. The fixed mold assembly 40 is provided with a groove 41.

[0046] When the fixed mold assembly 40 and the moving mold blank 20 are closed, the boss 22 extends into the groove 41. The boss 22, the inclined ejector 30 and the groove 41 surround to form the mold cavity. The inclined ejector 30 is provided with a forming part 31 for forming the undercut feature 51 of the product 50. The forming part 31 is located in the mold cavity. When the product 50 is formed, the inclined ejector 30 abuts against the inner side of the product 50, and the forming part 31 cooperates with the undercut feature 51 of the product 50.

[0047] The moving mold blank 20 can move relative to the fixed mold assembly 40 from the mold closing position to the mold opening position and then to the mold opening position in a direction away from the fixed mold assembly 40.

[0048] When the moving mold blank 20 moves from the mold closing position to the first position, the moving mold blank 20 moves, thereby causing the boss 22 to disengage from the inside of the product 50. The ejector plate 10 remains stationary, and the tilting drive unit 21 drives the inclined ejector 30 to move in a direction that is not parallel to the mold opening direction, so that the forming part 31 disengages from the undercut feature 51 of the product 50. In this embodiment, the tilting drive unit 21 drives the inclined ejector 30 to rotate relative to the ejector plate 10, so that the forming part 31 moves towards the middle of the product 50, thereby causing the forming part 31 to disengage from the undercut feature 51 of the product 50. This avoids the product 50 from disengaging from the groove 41 by the forming part 31 driving the undercut feature 51 when the moving mold blank 20 moves towards the mold opening direction.

[0049] When the moving mold blank 20 moves from the first position to the mold opening position, the moving mold blank 20, the ejector plate 10, and the inclined ejector 30 move together in the mold opening direction, allowing the moving mold blank 20, the ejector plate 10, and the inclined ejector 30 to smoothly move away from the mold groove 41 and the product 50. Since the product 50 itself is made of plastic, the product 50 will shrink and become smaller than the mold groove 41, so that the outer side of the product 50 can be smoothly removed from the mold groove 41 without the need for a special mold release angle. The interior of the product 50 can be designed with a mold release angle for the boss 22 without affecting the appearance of the product 50, achieving a zero mold release angle for the appearance of the product 50.

[0050] Please see Figure 5 and Figure 6 In some optional embodiments, the fixed mold assembly 40 includes a fixed mold blank 42, a fixed mold panel 43, and a fixed mold insert 44. The fixed mold blank 42 is movably engaged with the fixed mold panel 43, and the fixed mold assembly 40 can move in a direction close to or away from the fixed mold panel 43. The fixed mold blank 42 is provided with a plurality of movable limiting members 421. The fixed mold insert 44 is fixed on the fixed mold panel 43 and surrounds the fixed mold blank 42 to form a molding groove 41.

[0051] The moving mold blank 20 can move relative to the fixed mold panel 43 from the mold closing position to the mold opening direction away from the fixed mold panel 43 in sequence to the second position, the first position and the mold opening position.

[0052] When the moving mold blank 20 moves from the mold-closing position to the second position, the fixed mold blank 42, the moving mold blank 20, the ejector plate 10, and the inclined ejector 30 move together in the mold-opening direction, allowing the fixed mold blank 42 to have a certain floating distance relative to the fixed mold panel 43. The fixed mold blank 42 can drive the product 50 to detach from the fixed mold insert 44, causing the product 50 to initially detach from a part of the fixed mold assembly 40. Since there is still adhesive force between the product 50 and the surfaces of the fixed mold blank 42 and the boss 22, the moving mold blank 20 moves in the mold-opening direction. The boss 22 will move the product 50, which in turn moves the fixed mold blank 42. During the movement, the adhesive force between the product 50 and the fixed mold blank 42 and the surface of the boss 22 needs to overcome the weight of the product 50 and the friction and weight of the fixed mold blank 42. Therefore, the adhesive force will decrease during the movement, which avoids the product 50 being pulled too hard at the beginning of mold opening. This facilitates the subsequent separation of the boss 22 from the product 50 and the groove 41 from the product 50, and helps to improve the quality of the product 50.

[0053] When the moving mold blank 20 reaches the second position, the movable limiting member 421 and the fixed mold panel 43 limit each other to restrict the movement of the fixed mold blank 42 toward the mold opening direction. Subsequently, when the moving mold blank 20 moves from the second position to the first position, the fixed mold blank 42 is restricted and cannot continue to move, so the product 50 remains in the mold groove 41, while the moving mold blank 20 can continue to move, causing the boss 22 to disengage from the product 50.

[0054] In some optional embodiments, the fixed mold panel 43 is provided with a plurality of limiting grooves 431, and the movable limiting member 421 is movably engaged with the limiting grooves 431, thereby improving the stability of the movement of the movable limiting member 421. When the moving mold blank 20 moves from the mold closing position to the second position, the movable limiting member 421 moves relative to the limiting grooves 431. When the moving mold blank 20 reaches the second position, the movable limiting member 421 is limited by the inner wall of the limiting groove 431, thereby restricting the position of the fixed mold blank 42 through the cooperation of the movable limiting member 421 and the limiting grooves 431.

[0055] The specific structure of the movable limiting member 421 can be selected according to actual needs. For example, in some optional embodiments, the movable limiting member 421 is a plug screw, which is threadedly engaged with the fixed mold blank 42, and the cap of the plug screw is movablely engaged with the limiting slide groove 431. When the moving mold blank 20 reaches the second position, the cap of the plug screw is limited and engaged with the limiting slide groove 431.

[0056] In some alternative embodiments, when the moving mold blank 20 reaches the second position, the distance between the fixed mold blank 42 and the fixed mold panel 43 is 10 mm to 20 mm. In this embodiment, the distance between the fixed mold blank 42 and the fixed mold panel 43 is 15 mm, and the fixed mold blank 42 has a floating distance of 15 mm relative to the fixed mold panel 43, which helps to provide a certain buffering process for the reduction of adhesive force.

[0057] In some optional embodiments, the tilting drive part 21 is an tilted through hole provided on the moving mold blank 20, and the tilting ejector 30 is movably inserted in the tilted through hole. The extension direction of the tilted through hole is not parallel to the mold opening direction, and the angle between the extension direction of the tilted through hole and the mold opening direction is between 0-90°, such as 30°, 45°, 60°, etc. When the mold is closed, the tilting ejector 30 closes the tilted through hole to prevent the tilted through hole from communicating with the mold cavity.

[0058] In some optional embodiments, the fixed mold assembly 40 is provided with a locking mechanism 45. When the moving mold blank 20 moves from the mold closing position to the first position, the locking mechanism 45 locks with the ejector plate 10, thereby keeping the ejector plate 10 in a position relative to the fixed mold blank 42. This allows the angled ejector 30 to rotate only relative to the middle position of the product 50, causing the molding part 31 to disengage from the undercut feature 51 of the product 50, thus preventing the angled ejector 30 from pulling on the undercut feature 51 of the product 50. When the moving mold blank 20 moves from the first position to the mold opening position, the locking mechanism 45 releases its locking with the ejector plate 10, allowing the ejector plate 10 to move together with the moving mold blank 20 in the mold opening direction, causing the angled ejector 30 to disengage from the product 50. The specific structure of the locking mechanism 45 can be selected according to the actual needs. For example, the locking mechanism 45 includes a locking base set on the fixed mold blank 42 and a limiting block movably set on the locking base. The limiting block can move relative to the locking base to limit and cooperate with or disengage from the ejector plate 10.

[0059] In some optional embodiments, the ejector plate 10 is provided with a push block 11; when the moving mold blank 20 is in the mold-closed position, the push block 11 is arranged on the inner wall of the mold cavity and abuts against the product 50. When the moving mold blank 20 moves from the mold-closed position to the first position, the push block 11 abuts against the product 50 located in the mold cavity, so that the boss 22 of the moving mold blank 20 can be smoothly separated from the product 50, avoiding the product 50 being clamped on the boss 22 due to the shrinkage force of the product 50. When the moving mold blank 20 moves from the first position to the mold-opening position, the push block 11 moves with the ejector plate 10 in the mold-opening direction to disengage the push block 11 from the product 50. At this time, since the boss 22 and the inclined ejector 30 have both disengaged from the product 50, the push block 11 no longer needs to abut against the fixed mold blank 42, and the disengagement of the push block 11 from the product 50 facilitates the subsequent removal of the product 50.

[0060] In some optional embodiments, the fixed mold assembly 40 is provided with a fixed mold slider 46 and a slider drive module 47. When the moving mold blank 20 is in the closed position, the fixed mold slider 46 is arranged on the inner wall of the mold cavity. When the moving mold blank 20 moves from the closed position to the first position, the fixed mold slider 46 moves away from the product 50 under the drive of the slider drive module 47. The fixed mold slider 46 is used to cooperate in forming the features of the product 50. In this embodiment, when the moving mold blank 20 moves from the second position to the first position, the fixed mold slider 46 disengages from the product 50, facilitating the subsequent removal of the product 50. The specific structure of the slider drive module 47 can be selected according to actual needs. For example, the slider drive module 47 can be a pneumatic cylinder, an electric cylinder, or a hydraulic cylinder. In this embodiment, the slider drive module 47 is a hydraulic cylinder, which is fixed on the fixed mold blank 42, and its output shaft is drivenly connected to the fixed mold slider 46.

[0061] The mold structure for a product with zero ejection angle described above can be applied to plastic product manufacturing equipment, which includes: the mold structure for a product with zero ejection angle described above.

[0062] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mold structure for a product with zero ejection angle, characterized in that, include: Ejector plate, moving mold blank, angled ejector and fixed mold assembly; The moving mold blank and the ejector plate are movably connected. The moving mold blank can move towards or away from the ejector plate. The moving mold blank is provided with an inclined drive part and a boss. The inclined ejector is rotatably disposed on the ejector plate and is movably engaged with the inclined drive part. The mold assembly is provided with a molding groove; When the fixed mold assembly and the moving mold blank are closed, the boss extends into the groove, and the boss, the inclined top and the groove surround to form a mold cavity. The inclined top is provided with a forming part for forming the undercut feature of the product, and the forming part is located inside the mold cavity. The moving mold blank can be moved relative to the fixed mold assembly from the mold closing position to the mold opening position and then to the mold opening position in a direction away from the fixed mold assembly. When the moving mold blank moves from the mold closing position to the first position, the tilting drive unit drives the tilting top to move in a direction that is not parallel to the mold opening direction, so that the forming part disengages from the undercut feature of the product; When the moving mold blank moves from the first position to the mold opening position, the moving mold blank, the ejector plate, and the inclined ejector move together in the mold opening direction.

2. The mold structure for a product with zero ejection angle according to claim 1, characterized in that: The fixed mold assembly includes a fixed mold blank, a fixed mold panel, and a fixed mold insert. The fixed mold blank is movably fitted with the fixed mold panel. The fixed mold assembly can move in a direction close to or away from the fixed mold panel. The fixed mold blank is provided with a plurality of movable limiting members. The fixed mold insert is fixed on the fixed mold panel and surrounds the fixed mold blank to form the groove. The moving mold blank can be moved relative to the fixed mold panel from the mold closing position to the mold opening position, the first position, and the mold opening position in sequence in the mold opening direction away from the fixed mold panel; When the moving mold blank moves from the mold closing position to the second position, the fixed mold blank, the moving mold blank, the ejector plate, and the inclined ejector move together in the mold opening direction; When the moving mold blank reaches the second position, the movable limiting member cooperates with the fixed mold panel to limit the movement of the fixed mold blank toward the mold opening direction.

3. The mold structure for a product with zero ejection angle according to claim 2, characterized in that: The fixed mold panel is provided with a plurality of limiting slide grooves, and the movable limiting component is movably engaged with the limiting slide grooves; When the moving mold blank moves from the mold closing position to the second position, the movable limiting member moves relative to the limiting slide groove. When the moving mold blank reaches the second position, the movable limiting member engages with the inner wall of the limiting slide groove.

4. The mold structure for a product with zero ejection angle according to claim 3, characterized in that: The movable limiting component is a plug screw, which is threaded with the fixed mold blank and movablely engages with the limiting slide groove.

5. The mold structure for a product with zero ejection angle according to claim 2, characterized in that: When the moving mold blank reaches the second position, the distance between the fixed mold blank and the fixed mold panel is 10mm to 20mm.

6. A mold structure for a product with zero ejection angle according to any one of claims 1 to 5, characterized in that: The tilting drive part is an inclined through hole provided on the moving mold blank. The inclined top is movably inserted through the inclined through hole. The extension direction of the inclined through hole is not parallel to the mold opening direction.

7. A mold structure for a product with zero ejection angle according to any one of claims 1 to 5, characterized in that: The fixed mold assembly is provided with a locking mechanism. When the moving mold blank moves from the mold closing position to the first position, the locking mechanism locks with the ejector plate. When the moving mold blank moves from the first position to the mold opening position, the locking mechanism releases its locking with the ejector plate.

8. A mold structure for a product with zero ejection angle according to any one of claims 1 to 5, characterized in that: The ejector plate is provided with a push block; When the moving mold blank is in the mold closing position, the push block is arranged on the inner wall of the mold cavity; When the moving mold blank moves from the mold closing position to the first position, the push block abuts against the product located inside the mold cavity; When the moving mold blank moves from the first position to the mold opening position, the push block moves with the ejector plate in the mold opening direction to disengage the push block from the product.

9. A mold structure for a product with zero ejection angle according to any one of claims 1 to 5, characterized in that: The fixed mold assembly is provided with a fixed mold slider and a slider drive module; When the moving mold blank is in the mold closing position, the fixed mold slider is arranged on the inner wall of the mold cavity; When the moving mold blank moves from the mold closing position to the first position, the fixed mold slider moves away from the product under the drive of the slider drive module.

10. A plastic product manufacturing equipment, characterized in that, include: A mold structure for a product with zero ejection angle as described in any one of claims 1 to 9.

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