CA2272206A1 - Device for crystallizing a mouth on a polyester container - Google Patents
Device for crystallizing a mouth on a polyester container Download PDFInfo
- Publication number
- CA2272206A1 CA2272206A1 CA002272206A CA2272206A CA2272206A1 CA 2272206 A1 CA2272206 A1 CA 2272206A1 CA 002272206 A CA002272206 A CA 002272206A CA 2272206 A CA2272206 A CA 2272206A CA 2272206 A1 CA2272206 A1 CA 2272206A1
- Authority
- CA
- Canada
- Prior art keywords
- mouth
- heat
- conductor
- container
- crystallization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
- B29B13/023—Half-products, e.g. films, plates
- B29B13/024—Hollow bodies, e.g. tubes or profiles
- B29B13/025—Tube ends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0063—After-treatment of articles without altering their shape; Apparatus therefor for changing crystallisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0041—Crystalline
Abstract
A device for crystallizing a mouth on a polyester container provides a heat conductor being mounted on each of fixing posts, and an additional radiation heat source being provided beside the heat conductor to supply heat to the conductor. The heat transmits to the post through the conductor to reduce the contraction of the container blank at an inner side thereof.
Description
DEVICE FOR CRYSTALLIZING A MOUTH ON A POLYESTER CONTAINER
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a device for crystallizing a threaded area provided on the mouth of a polyester container.
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a device for crystallizing a threaded area provided on the mouth of a polyester container.
2. Description of Related Art A conventional polyester container usually has a threaded area at the mouth portion thereof, and because the threaded area is made from an amorphous polymer, it is easily deformed under a high temperature or a high pressure. Therefore, the temperature of a liquid filling in the container has to be lowered in order to keep the threaded area from being deformed. But, a lowered temperature for the filling liquid and the air therein frequently results in a contamination of germs. To overcome the deficiency, a prior art has been disclosed a way to treat the mouth portion by means of crystallization so as to intensify the heat resistance and the pressure resistance thereof. The treatment is widely utilized in the field of hot filling product.
The treatment of crystallization applied in the prior art is that the polyester polymer is crystallized by heat to improve the physical property and the mechanical property thereof . Nevertheless, it can be understood that no thermal deformation generated in the process of crystallization is a key factor to keep the dimension of the mouth portion unchanged. Therefore, the method and the technique involved in the treatment substantially affect the quality of the container.
Presently, SIDEL COMPANY in FRANCE, ELECTRICA FORM
COMPANY in U.S.A., and NISSEI COMPANY in Japan have manufactured crystallization machines for the threaded mouth on a polyester container. There is a common feature of the machines that they basically provide a single external heating system to focus on the threaded portion of the mouth. In addition, there are two methods are adopted in the machines to process the mouth. One is called "insert crystallization" and the other is called "insert free crystallization".
The "insert crystallization" provides a better stability in dimension, but it is hard to eject from the insert. If an unhardened container blank is ejected from the insert at a high temperature, the polymer is almost in a state of visco-elastic body and it is easily deformed during ejecting. In order to avoid the shortcoming, the "insertfree crystallization"isdeveloped afterwards.But, it is not easy for the "insert free crystallization" to control the dimension of the mouth properly without the insert. Therefore, the technique offered by the "insert free crystallization" is not so ideal either. A detail explanation for these two methods will be further described hereinafter.
Referring to Figs. 5, 6, 7, and 8, a threaded mouth portion 10 on a container blank is detachably fitted to a adapter post 11 on a crystallizing machine. A radiation heat source 12 is provided around the threaded mouth portion externally. The thread on the mouth has a shape of different thickness of tl, t2, and t3, and it leads to a lot of dead corners, which are unable to receive the radiation heat equally. Thus, a lot of cold spots 14 are 5 formed on the threaded mouth unavoidably. It can be understood that different thickness can result in an irregular contraction or expansion of volume for the polymer in the process of crystallization. Therefore, a thermal stress is induced at the mouth of the container 10 such that the threaded portion of the mouth is deformed disadvantageously. Furthermore, it can be clear from a crystallization curve C and a temperature curve to that there are cold spots 14 in the crystallization zone A3.
Even if it is at the best crystallized point A4, cold spots 14 still exist. Hence, the insert crystallization is hard to overcome the disadvantage of a deformed mouth induced by a thermal stress.
Based on the principle described above, a deformation W occurs while the mouth is crystallized completely. In order to eliminate the deformation W, the insert free crystallization is introduced to resolve the problem. Due to no fixing post 11 provided, the method of insert free crystallization is difficult to keep the radial dimension of the mouth on a container blank correctly. Hence, it is hard for the insert free crystallization to carry out the quality control of the mouth and a greater error in dimension may generate undesirably.
SUMMARY OF THE INVENTION
The treatment of crystallization applied in the prior art is that the polyester polymer is crystallized by heat to improve the physical property and the mechanical property thereof . Nevertheless, it can be understood that no thermal deformation generated in the process of crystallization is a key factor to keep the dimension of the mouth portion unchanged. Therefore, the method and the technique involved in the treatment substantially affect the quality of the container.
Presently, SIDEL COMPANY in FRANCE, ELECTRICA FORM
COMPANY in U.S.A., and NISSEI COMPANY in Japan have manufactured crystallization machines for the threaded mouth on a polyester container. There is a common feature of the machines that they basically provide a single external heating system to focus on the threaded portion of the mouth. In addition, there are two methods are adopted in the machines to process the mouth. One is called "insert crystallization" and the other is called "insert free crystallization".
The "insert crystallization" provides a better stability in dimension, but it is hard to eject from the insert. If an unhardened container blank is ejected from the insert at a high temperature, the polymer is almost in a state of visco-elastic body and it is easily deformed during ejecting. In order to avoid the shortcoming, the "insertfree crystallization"isdeveloped afterwards.But, it is not easy for the "insert free crystallization" to control the dimension of the mouth properly without the insert. Therefore, the technique offered by the "insert free crystallization" is not so ideal either. A detail explanation for these two methods will be further described hereinafter.
Referring to Figs. 5, 6, 7, and 8, a threaded mouth portion 10 on a container blank is detachably fitted to a adapter post 11 on a crystallizing machine. A radiation heat source 12 is provided around the threaded mouth portion externally. The thread on the mouth has a shape of different thickness of tl, t2, and t3, and it leads to a lot of dead corners, which are unable to receive the radiation heat equally. Thus, a lot of cold spots 14 are 5 formed on the threaded mouth unavoidably. It can be understood that different thickness can result in an irregular contraction or expansion of volume for the polymer in the process of crystallization. Therefore, a thermal stress is induced at the mouth of the container 10 such that the threaded portion of the mouth is deformed disadvantageously. Furthermore, it can be clear from a crystallization curve C and a temperature curve to that there are cold spots 14 in the crystallization zone A3.
Even if it is at the best crystallized point A4, cold spots 14 still exist. Hence, the insert crystallization is hard to overcome the disadvantage of a deformed mouth induced by a thermal stress.
Based on the principle described above, a deformation W occurs while the mouth is crystallized completely. In order to eliminate the deformation W, the insert free crystallization is introduced to resolve the problem. Due to no fixing post 11 provided, the method of insert free crystallization is difficult to keep the radial dimension of the mouth on a container blank correctly. Hence, it is hard for the insert free crystallization to carry out the quality control of the mouth and a greater error in dimension may generate undesirably.
SUMMARY OF THE INVENTION
The present invention resides in that a second heat source is provided in the crystallization machine such that the heat from the second heat source flows along the adapter post and is transmitted to the inner smooth surface of the mouth on the container blank evenly to eliminate cold points .
In the mean time, the second heat source allows the mouth to keep a softer inner side thereof while the outer side thereof is crystallized. That is, the inner side of the mouth keeps at a certain temperature to reduce a radial thermal stress resulting from contraction due to crystallization such that an easy release of the blank can be reached without deformation.
An object of the present invention is to provide a device for crystallizing a mouth on a polyester container , which can offer additional heat evenly to the mouth of a container blank at the inner side thereof so as to eliminate cold spots for preventing the mouth from deformation.
Another object of the present invention is to provide a device for crystallizing a mouth on a polyester container, with which the mouth can have a soft inner part and a hard outer part so as to be released easily.
The present invention can be more fully understood by reference to the following description and accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a semi-plan view of the mouth on a container to illustrate a preferred embodiment of the present invention.
Fig. 2 is diagrammatic view of Fig. 1 to illustrate a crystallized curve thereof.
Fig. 3 is a diagrammatic view of the preferred embodiment of the present invention.
In the mean time, the second heat source allows the mouth to keep a softer inner side thereof while the outer side thereof is crystallized. That is, the inner side of the mouth keeps at a certain temperature to reduce a radial thermal stress resulting from contraction due to crystallization such that an easy release of the blank can be reached without deformation.
An object of the present invention is to provide a device for crystallizing a mouth on a polyester container , which can offer additional heat evenly to the mouth of a container blank at the inner side thereof so as to eliminate cold spots for preventing the mouth from deformation.
Another object of the present invention is to provide a device for crystallizing a mouth on a polyester container, with which the mouth can have a soft inner part and a hard outer part so as to be released easily.
The present invention can be more fully understood by reference to the following description and accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a semi-plan view of the mouth on a container to illustrate a preferred embodiment of the present invention.
Fig. 2 is diagrammatic view of Fig. 1 to illustrate a crystallized curve thereof.
Fig. 3 is a diagrammatic view of the preferred embodiment of the present invention.
5 Fig. 4 is a diagrammatic view of a crystallization machine attaching a plurality of device of the present invention.
Fig. 5 is a semi-sectional view of a mouth of a container with an insert to illustrate a conventional method of crystallization.
Fig. 6 is a semi-sectional view of a mouth of a container.
Fig. 7 is a semi-plan view of the mouth on a container to illustrate a crystallized curve thereon.
Fig. 8 is a semi-plan view of the mouth on a container to illustrate a deformation thereon.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in Fig. 1, 2, 3, and 4, due to providing a second heat source, the threaded mouth 10 forms a hardened zone A1 and a soft zone A2. The soft zone A2 is hardened gradually and the time curve T illustrates the hardened time needed for the zone A1 and zone A2. The adapter post 20 has mounted a heat conductor 21 at an end thereof and the heat conductor 21 receives the radiation heat from a second heat source 22. Then, the heat received by the conductor 21 transmits along the post and toward the other end of the post 20. The mouth on a container blank 13 fitting with the post 20 is softened thermally by the heat and forms the soft zone A2. The heat in the zone A2 can move toward zone A1 to eliminate the cold spots, which are arisen from the heat of the first heat source 12 reaching these spots difficultly. Therefore, it is advantageous for the container blank 13 to release from the fixing post easily and it is preventable for the container blank 13 from being deformed during releasing.
In addition, when the mouth of the container blank 13 is completely crystallized, the first heat source 12 is stopped transmitting the heat to the mouth but the second heat source 21 still supplies the heat to the fixing post through the conductor 21. Therefore, the post 20 maintains at a certain temperature and it can reduce the radial force generated on the contracted mouth in the 15 process of crystallization to press the post 20 so as to minimize the radial shear force during the container blank 13 is releasing.
While the invention has been described with reference to the preferred embodiment, it is to be understood that 20 modifications or variations may be easily made without departing from the spirit of the invention, which is defined by the appended claims.
Fig. 5 is a semi-sectional view of a mouth of a container with an insert to illustrate a conventional method of crystallization.
Fig. 6 is a semi-sectional view of a mouth of a container.
Fig. 7 is a semi-plan view of the mouth on a container to illustrate a crystallized curve thereon.
Fig. 8 is a semi-plan view of the mouth on a container to illustrate a deformation thereon.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in Fig. 1, 2, 3, and 4, due to providing a second heat source, the threaded mouth 10 forms a hardened zone A1 and a soft zone A2. The soft zone A2 is hardened gradually and the time curve T illustrates the hardened time needed for the zone A1 and zone A2. The adapter post 20 has mounted a heat conductor 21 at an end thereof and the heat conductor 21 receives the radiation heat from a second heat source 22. Then, the heat received by the conductor 21 transmits along the post and toward the other end of the post 20. The mouth on a container blank 13 fitting with the post 20 is softened thermally by the heat and forms the soft zone A2. The heat in the zone A2 can move toward zone A1 to eliminate the cold spots, which are arisen from the heat of the first heat source 12 reaching these spots difficultly. Therefore, it is advantageous for the container blank 13 to release from the fixing post easily and it is preventable for the container blank 13 from being deformed during releasing.
In addition, when the mouth of the container blank 13 is completely crystallized, the first heat source 12 is stopped transmitting the heat to the mouth but the second heat source 21 still supplies the heat to the fixing post through the conductor 21. Therefore, the post 20 maintains at a certain temperature and it can reduce the radial force generated on the contracted mouth in the 15 process of crystallization to press the post 20 so as to minimize the radial shear force during the container blank 13 is releasing.
While the invention has been described with reference to the preferred embodiment, it is to be understood that 20 modifications or variations may be easily made without departing from the spirit of the invention, which is defined by the appended claims.
Claims (2)
1. A device for crystallizing a threaded mouth on a polyester container in a crystallization machine, comprising:
a plurality of adapter posts, being attached on said crystallization machine and each of said plurality of adapter posts being able to be fitted with said threaded mouth; and a first radiation heat source, being provided beside said plurality of adapter posts to focus on each of said threaded mouths externally;
characterized in that a heat conductor being mounted on each of said plurality of adapter post at an end thereof, a second radiation heat source being provided beside said heat conductor to supply heat to said conductor;
whereby, the heat from said second heat source transmits to the post through the conductor to reduce the contraction of the container blank at an inner side thereof.
a plurality of adapter posts, being attached on said crystallization machine and each of said plurality of adapter posts being able to be fitted with said threaded mouth; and a first radiation heat source, being provided beside said plurality of adapter posts to focus on each of said threaded mouths externally;
characterized in that a heat conductor being mounted on each of said plurality of adapter post at an end thereof, a second radiation heat source being provided beside said heat conductor to supply heat to said conductor;
whereby, the heat from said second heat source transmits to the post through the conductor to reduce the contraction of the container blank at an inner side thereof.
2. A device for crystallizing a mouth on a polyester container according to claim 1, wherein each of said plurality of adapter posts is kept at a specified temperature constantly to minimize the contraction of the container blank at an inner side thereof.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002272206A CA2272206A1 (en) | 1999-05-19 | 1999-05-19 | Device for crystallizing a mouth on a polyester container |
| DE29908980U DE29908980U1 (en) | 1999-05-19 | 1999-05-21 | Device for crystallizing an opening in a polyester container |
| FR0006433A FR2793723B3 (en) | 1999-05-19 | 2000-05-19 | DEVICE FOR CRYSTALLIZING AN OPENING ON A POLYESTER CONTAINER |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002272206A CA2272206A1 (en) | 1999-05-19 | 1999-05-19 | Device for crystallizing a mouth on a polyester container |
| DE29908980U DE29908980U1 (en) | 1999-05-19 | 1999-05-21 | Device for crystallizing an opening in a polyester container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2272206A1 true CA2272206A1 (en) | 2000-11-19 |
Family
ID=32094393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002272206A Abandoned CA2272206A1 (en) | 1999-05-19 | 1999-05-19 | Device for crystallizing a mouth on a polyester container |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2272206A1 (en) |
| DE (1) | DE29908980U1 (en) |
| FR (1) | FR2793723B3 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6139812A (en) * | 1999-07-07 | 2000-10-31 | Technology Concepts Products, Inc. | Crystallizing machine |
| US6315967B1 (en) * | 1999-07-07 | 2001-11-13 | Schmalbach-Lubeca Ag | Crystallizing process |
| CN1202976C (en) * | 2001-01-22 | 2005-05-25 | 珠海保税区中富聚酯啤酒瓶有限公司 | Crystallized mouth structure of polyester beer bottle and its making process |
-
1999
- 1999-05-19 CA CA002272206A patent/CA2272206A1/en not_active Abandoned
- 1999-05-21 DE DE29908980U patent/DE29908980U1/en not_active Expired - Lifetime
-
2000
- 2000-05-19 FR FR0006433A patent/FR2793723B3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE29908980U1 (en) | 1999-09-30 |
| FR2793723B3 (en) | 2001-06-08 |
| FR2793723A3 (en) | 2000-11-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |