IES86218B2 - Blow moulding of bottles - Google Patents
Blow moulding of bottlesInfo
- Publication number
- IES86218B2 IES86218B2 IES20130161A IES86218B2 IE S86218 B2 IES86218 B2 IE S86218B2 IE S20130161 A IES20130161 A IE S20130161A IE S86218 B2 IES86218 B2 IE S86218B2
- Authority
- IE
- Ireland
- Prior art keywords
- bottle
- neck
- blow
- blow pin
- mould
- Prior art date
Links
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- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
A method for blow moulding a bottle 5 having a neck 2 comprises closing a mould around a parison of thermoplastics material, penetrating the parison with a blow pin 1 and, inflating the parison against the walls of the mould to form a bottle 5 having a neck 2, a longitudinal axis of the blow pin 1 being aligned with a longitudinal axis through the neck 2 of the bottle 5. The blow pin 1 has a leading face 3 which is substantially flat and the method comprises advancing the blow pin 1 to press the flat face 3 of the blow pin 1 against the base wall region 4 of the bottle 5 opposite to the neck 2. <Figure 1>
Description
This invention relates to technical blow moulding.
Injection moulded hollow containers such as bottles are created using an injection moulding process. The base of the bottle is created with a high level of control over the wall thickness of the part. A lid Is created using a separate injection mould. The two pieces are joined together and welded to create a one piece hollow part.
Conventional injection moulded bottles have a weld which is structurally weak. The weld creates an area of increased stress and under testing, injection moulded bottles often fail at the weld seam,
This invention is directed towards providing a blow moulding system which will address at least some of these problems.
Statements of Invention
According to the invention there is provided a method for blow moulding a bottle having a neck comprising the steps oftclosing a mould around a parison of thermoplastics material;
penetrating the parison with a blow pin;
inflating the parison against the walls of the mould to form a bottle having a neck, a longitudinal axis of the blow pin being aligned with a longitudinal axis through the neck of the bottle;
using the blow pin, flattening a region of a base wall of the bottle opposite to the neck to form a preset wall thickness in the base wall region opposite to the neck;
S862Ί 8 removing the blow pin;
opening the mould; and
removing the blow moulded bottle from the mould, the bottle having a preset wall thickness in the base wall region opposite to the neck region opposite to the neck.
In one embodiment the blow pin has a leading face which is substantially flat and the method comprises advancing the blow pin to press the flat face of the blow pin against the base wall region of the bottle opposite to the neck.
Preferably the method comprises inserting a tube or a probe into the bottle through the neck of the bottle and attaching the tube or the probe to the base of the bottle.
The invention also provides blow moulding apparatus for blow moulding a hollow bottle of thermoplastics material, the bottle having a neck, the blow moulding apparatus comprising a mould and a blow pin wherein the blow pin has a leading face which is substantially flat for engagement with thermoplastic material in the mould in a region of the base of the bottle opposite to the neck for flattening the base wall region to form a pre-set wall thickness in the base wall region opposite to the neck.
Brief Description of the Drawings
The invention will be more clearly understood from the following description of an embodiment 25 thereof, given by way of example only, with reference to the accompanying drawings, in which:
Fig. 1 is an isometric, partially cross-sectional view illustrating blow moulding of a bottle according to the invention; and
Figs. 2 and 3 are cross sectional views illustrating steps during moulding with a blow pin in different positions.
Detailed Description
The invention provides a blow moulded bottle 5 with a controlled internal wall thickness at the base.
A bottle 5 having a neck is blow moulded by closing a mould around a parison of thermoplastics material. The parison is penetrated with a blow pin 1 and the parison is inflated against the walls of a mould to form a bottle having a neck 2. A longitudinal axis of the blow pin 1 is aligned with a longitudinal axis through the neck 2 of the bottle 5 using the blow pin 1. A region of a base wall of the bottle opposite to the neck 2 is flattened to form a preset wall thickness in the base wall region opposite to the neck 2. The blow pin is then removed, the mould is opened and the blow moulded bottle is removed from the mould. The bottle 5 has a preset wall thickness in the base wall region opposite to the neck 2,
In the invention, a flat section is created in the base at a region 4 which is located concentrically with the neck opening 2 with a controlled wall thickness on the base. A blow pin 1 enters the neck bore and moves all the way to the base to create a flat section 10. The distance the blow pin 1 can move downwards is controlled to create a uniform wall thickness in one section 10 for every part produced. During the blow moulding process, a seam of material 7 is created by the mould. The blow pin 1 moves down to a position located concentric with the neck bore 2. The blow pin 1 has a leading face 3 which is substantially flat and the pin 1 compresses the seam 7 in this location 10, creating a recess which has a determined thickness based on the distance the blow pin 1 has travelled. The material 9 surrounding the blow pin 1 is unaffected by the compression of the seam.
The bottle 5 is created on a blow moulding machine and is made as one piece with no secondary operation required to complete the part. The single piece article is structurally more rigid under vertical loading. In testing, the blow moulded article is less likely to fail near the lid section from the previous injection moulded article.
The uniform wall thickness allows for other parts to be assembled to the blow moulded part. Tubes and probes can be inserted into the part from the neck and securely attached to the base using a joining process.
The invention may be applied to blow moulding of hollow articles which require a controlled wall thickness on the base positioned concentrically with the neck bore opening.
No machine modifications are required to create the desired control of the wall thickness. The 5 process requires a blow pin with a flat head that can inserted all the way to the base of part, compressing the material to form a determined wall thickness.
The flaf controlled wall thickness can be used to allow other assembly components, such as a tube but not exclusively so, to be joined to the blow moulded part.
The invention is not limited to the embodiments hereinbefore described which may be varied in construction and detail.
Claims (5)
1. A method for blow moulding a bottle having a neck comprising the steps of:5 closing a mould around a parison of thermoplastics material; penetrating the parison with a blow pin; inflating the parison against the walls of the mould to form a bottle having a neck, 10 a longitudinal axis of the blow pin being aligned with a longitudinal axis through the neck of the bottle; using the blow pin, flattening a region of a base wall of the bottle opposite to the neck to form a preset wall thickness in the base wall region opposite to the neck; removing the blow pin; opening the mould; and 20 removing the blow moulded bottle from the mould, the bottle having a preset wall thickness in the base wail region opposite to the neck region opposite to the neck.
2. A method as claimed in claim 1 wherein the blow pin has a leading face which is substantially flat and the method comprises advancing the blow pin to press the flat face 25 of the blow pin against the base wall region of the bottle opposite to the neck.
3. A method as claimed in claim 1 or 2 comprising inserting a tube or a probe into the bottle through the neck of the bottle and attaching the tube or the probe to the base of the bottle. 30
4. Blow moulding apparatus for blow moulding a hollow bottle of thermoplastics material, the bottle having a neck, the blow moulding apparatus comprising a mould and a blow pin wherein the blow pin has a leading face which is substantially flat for engagement with thermoplastic material in the mould in a region of the base of the bottle opposite to the neck for flattening the base wall region to form a pre-set wall thickness in the base wall region opposite to the neck.
5. , A blow moulding system substantially as hereinbefore described with reference to the 5 accompanying drawings for blow moulding a bottle of thermoplastics material having a neck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IES20130161 IES20130161A2 (en) | 2013-05-08 | 2013-05-08 | Blow moulding of bottles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IES20130161 IES20130161A2 (en) | 2013-05-08 | 2013-05-08 | Blow moulding of bottles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IES86218B2 true IES86218B2 (en) | 2013-07-03 |
| IES20130161A2 IES20130161A2 (en) | 2013-07-03 |
Family
ID=48793646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IES20130161 IES20130161A2 (en) | 2013-05-08 | 2013-05-08 | Blow moulding of bottles |
Country Status (1)
| Country | Link |
|---|---|
| IE (1) | IES20130161A2 (en) |
-
2013
- 2013-05-08 IE IES20130161 patent/IES20130161A2/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IES20130161A2 (en) | 2013-07-03 |
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