CA2216177A1 - Adjustable bubble guide or cage - Google Patents
Adjustable bubble guide or cage Download PDFInfo
- Publication number
- CA2216177A1 CA2216177A1 CA002216177A CA2216177A CA2216177A1 CA 2216177 A1 CA2216177 A1 CA 2216177A1 CA 002216177 A CA002216177 A CA 002216177A CA 2216177 A CA2216177 A CA 2216177A CA 2216177 A1 CA2216177 A1 CA 2216177A1
- Authority
- CA
- Canada
- Prior art keywords
- bubble
- rod
- ring
- engage
- frame
- 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
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/907—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using adjustable calibrators, e.g. the dimensions of the calibrator being changeable
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/355—Conveyors for extruded articles
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
- B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
A bubble guide unit according to the present invention comprises two concentric frames, at least one of which rotates relative to the other, through which the film bubble passes. At least four bubble guiding rods are arranged symmetrically to each pivotally engage one frame at one end and to freely engage the other frame near its other end. Freely engage here means that the other end of each rod is free to pivot to some extent as well as to move in the direction of its length beyond the pivoting point and back. This is most easily accomplished by a pivoting ring through which the rod passes or, less elegantly, by a fixed ring having an aperture larger than the rod diameter.
Description
ADJUSTABLE BUBBLE GUIDE OR CiA~E
BACKGROUND OF THE INVENTION
l. Field of the Invention The present invention relates to the ~lastics industry in general and in particular to S al~l)alal~ls for extruding blown fi1m. More particularly, it re1ates to post extrusion devices generally known as bubble cages or guides.
BACKGROUND OF THE INVENTION
l. Field of the Invention The present invention relates to the ~lastics industry in general and in particular to S al~l)alal~ls for extruding blown fi1m. More particularly, it re1ates to post extrusion devices generally known as bubble cages or guides.
2. Re1ated Art All hlown film is extruded either vertically~ up or down, or horizontally. In all instances, once the polymer exits the cylindrica1 die, it is referred to as a "bubble" and 10 is drawn from the die by means of two rollers (usually known as "NIP Rnllers"~ once the bubble has been collapsed. The distance between the die surface and the NIP
Rollers may vary between six to over hundred feet. After exiting the die, the bubble is in~lated with air to the ~lesired di~me~er. Normally, the air intlates the ~cylindrical) bubble through the die and once the requisite diameter has been reached inflation l S ceases and the air is trapped between the face of the die and the NIP Roller.
The bubble must be guided to ensure good centering and tracking with minimum side-to-side oscillation or of~:centre movement. The guidlng has heen accomplished by means of bubble cages; individual guiding bars; guiding bars interconnected by means of chains, gears and the like; and a variety of other methods.
S SUMMARY OF THE~ INVENTION
The present invention provides a simple, adjustable bubble guide or cage (hereafter guide).
A bubble guide unit according to the present invention comprises two concentric frames, at 1east one ol which rotates relabve to the other, through which the film 10 bubble passes. At least four bubhle guiding rods are arranged symmetrically to each pivotally engage one frame at one end and to lreely engage the other frame near its other end. Freely engage here mean~s that the other end of each rod is free to pivot to some extent as well as to move in the direction of its length beyond the pivoting point and back. This is most easily accomplished by a pivoting ring through which 15 the rod passes or, less elegantly, by a fixed ring having an aperture larger than the rod diameter.
When the two concentric frames are rotated one relative to the other, the concentric square defined by the four N)ds will change its area, which can thus be adjusted to fit the diameter of the guided film bubble.
Such hubble guide units may7 of course, be stacked vertically or horizontally and their rotating frames interconnected to allow for a single adjustment mechanism.
BRlEF DESCRIPT10N OF THE DlRAWINGS
S The preferrell embodiment of the present invention wi11 now be described in conjunction with the annexed drawing figures, in which:
Figure I is a plan view of a guide unit according to the present invention in its maximum diameter position;
Figure 2 shows the unit of Figure I but in the ~ diameter position;
l0 Figure 3 shows the unit of Figure l but in the 3~-diameter position;
Figure 4 shows the unit of Figure l but in its minimllm diametet position;
Figure 5 shows a unit of the bubble guide construction in perspective; and Figures 6a and 6b ~hows the unit of Figure 5 in plan view in its maximum and minimllm positions respectively.
DETAILED DESCRIPT:ION OF THE PREFER~ED EMB(~DIMENTS
Reterring now to Figure l the bubble guide units comprises two concentric ring-frames a stationary outside frame 10 and an inner rotatahle frame 11. Four guidervds ~shown symbolically as lines) 12 13 14 and 15. The rod 12 is attached at one end to a pivot 16 anchored to the outer ring 10 while it is movably attached near its other end to a pivot 17 anchored to the inner ring l 1. The other rods 13~ 14 and 15 are similarly attached. The rods 12 13 14 and 15 must be of sufficient length so as not retract out of the pivot 17 at the point of minimum diameter in Figure 4.
10 E~eferring now to Figures 5 6a and 6b of the drawings the preferred emhodiment is described. It is generally critical in the blown film process to keep the film tube aligned with the top nip and the blown film die. The blown film process is normally an upward extrusion. However downward extrusion has been used in the past.
As may be seen the bubble guide is constructed with two counter rotating meml~ers 15 (rings in the figures) with a hole in the centre of the inner member and attached to the rotating and stationary members are vertical connecting posts. The lower outer ring and the lower inner ring would act like a bearing where the outer ring would remain stationary and the inner ring being the race of the bearing that would be able to rotate.
The outer ring holds a series of posts that can rotate around their longi111din~1 axes.
The inner ring a1so has a series of posts that will also be ahle to rotate in the same manner. The lower rings and the upper rings are a mirror image of each other. The posts are mounted on the rings thereby connecting the upper and lower rings. In the S example showing which we call a square, there are tour posts on the outer ring and four po~sts on the inner ring. The outer posts have been drilled to accept a round rod that has been fixed with a setscrew. The four posts on the inner ring have been dril1ed through to allow the mating rod to slide freely as required. The construction operates as follows.
Iû With the outer ring held stationary, and the four posts with the tension rods or spokes fixed with enough length to pass through the inner post on the same plain, and the inner rmg is rotated, the ~spokes will move inward symmetrically. The focal distance is compensated by allowing the spokes to retract through the inner post. Therefore, all four posts rotating on the inner ring will collectively but independently move the 15 four parallel rods together thereby reducing the ~ meter of the opening.
There are no limitations on the number of vertical posts. However, four, six or eight wou1d create a square, hexagon or octagon shape. The horizonta1 rods are on1y limited in quantity by the physical restrictions.
To reduce friction, the horizonta1 rods wi11 have a covering and this cover may be in the form of rollers, either solid or individual that woulcl rotate on the spokes by way of friction if enough friction were applied.
The height of the construction is unlimited and the unit shown may be stacked repeatedly as desired.
S The diameter of the hole in the centre, its only purpose is to allow the film to pass through the openings from the die to the top nip.
While in the drawings a bubble guide unit is shown having only four rods ~which, of course, are arranged at staggered distances from the plane of the rings 10 and 11, in order not to interfere with ea~h other, more rods may be employed in a unit, so as to 10 form a more than four-sided pvlygon. The additional rods would also be staggered in di.stances from the ring-plane. There is naturally a practical limit to the number of rods employed, depending on the ring diameter.
Rollers may vary between six to over hundred feet. After exiting the die, the bubble is in~lated with air to the ~lesired di~me~er. Normally, the air intlates the ~cylindrical) bubble through the die and once the requisite diameter has been reached inflation l S ceases and the air is trapped between the face of the die and the NIP Roller.
The bubble must be guided to ensure good centering and tracking with minimum side-to-side oscillation or of~:centre movement. The guidlng has heen accomplished by means of bubble cages; individual guiding bars; guiding bars interconnected by means of chains, gears and the like; and a variety of other methods.
S SUMMARY OF THE~ INVENTION
The present invention provides a simple, adjustable bubble guide or cage (hereafter guide).
A bubble guide unit according to the present invention comprises two concentric frames, at 1east one ol which rotates relabve to the other, through which the film 10 bubble passes. At least four bubhle guiding rods are arranged symmetrically to each pivotally engage one frame at one end and to lreely engage the other frame near its other end. Freely engage here mean~s that the other end of each rod is free to pivot to some extent as well as to move in the direction of its length beyond the pivoting point and back. This is most easily accomplished by a pivoting ring through which 15 the rod passes or, less elegantly, by a fixed ring having an aperture larger than the rod diameter.
When the two concentric frames are rotated one relative to the other, the concentric square defined by the four N)ds will change its area, which can thus be adjusted to fit the diameter of the guided film bubble.
Such hubble guide units may7 of course, be stacked vertically or horizontally and their rotating frames interconnected to allow for a single adjustment mechanism.
BRlEF DESCRIPT10N OF THE DlRAWINGS
S The preferrell embodiment of the present invention wi11 now be described in conjunction with the annexed drawing figures, in which:
Figure I is a plan view of a guide unit according to the present invention in its maximum diameter position;
Figure 2 shows the unit of Figure I but in the ~ diameter position;
l0 Figure 3 shows the unit of Figure l but in the 3~-diameter position;
Figure 4 shows the unit of Figure l but in its minimllm diametet position;
Figure 5 shows a unit of the bubble guide construction in perspective; and Figures 6a and 6b ~hows the unit of Figure 5 in plan view in its maximum and minimllm positions respectively.
DETAILED DESCRIPT:ION OF THE PREFER~ED EMB(~DIMENTS
Reterring now to Figure l the bubble guide units comprises two concentric ring-frames a stationary outside frame 10 and an inner rotatahle frame 11. Four guidervds ~shown symbolically as lines) 12 13 14 and 15. The rod 12 is attached at one end to a pivot 16 anchored to the outer ring 10 while it is movably attached near its other end to a pivot 17 anchored to the inner ring l 1. The other rods 13~ 14 and 15 are similarly attached. The rods 12 13 14 and 15 must be of sufficient length so as not retract out of the pivot 17 at the point of minimum diameter in Figure 4.
10 E~eferring now to Figures 5 6a and 6b of the drawings the preferred emhodiment is described. It is generally critical in the blown film process to keep the film tube aligned with the top nip and the blown film die. The blown film process is normally an upward extrusion. However downward extrusion has been used in the past.
As may be seen the bubble guide is constructed with two counter rotating meml~ers 15 (rings in the figures) with a hole in the centre of the inner member and attached to the rotating and stationary members are vertical connecting posts. The lower outer ring and the lower inner ring would act like a bearing where the outer ring would remain stationary and the inner ring being the race of the bearing that would be able to rotate.
The outer ring holds a series of posts that can rotate around their longi111din~1 axes.
The inner ring a1so has a series of posts that will also be ahle to rotate in the same manner. The lower rings and the upper rings are a mirror image of each other. The posts are mounted on the rings thereby connecting the upper and lower rings. In the S example showing which we call a square, there are tour posts on the outer ring and four po~sts on the inner ring. The outer posts have been drilled to accept a round rod that has been fixed with a setscrew. The four posts on the inner ring have been dril1ed through to allow the mating rod to slide freely as required. The construction operates as follows.
Iû With the outer ring held stationary, and the four posts with the tension rods or spokes fixed with enough length to pass through the inner post on the same plain, and the inner rmg is rotated, the ~spokes will move inward symmetrically. The focal distance is compensated by allowing the spokes to retract through the inner post. Therefore, all four posts rotating on the inner ring will collectively but independently move the 15 four parallel rods together thereby reducing the ~ meter of the opening.
There are no limitations on the number of vertical posts. However, four, six or eight wou1d create a square, hexagon or octagon shape. The horizonta1 rods are on1y limited in quantity by the physical restrictions.
To reduce friction, the horizonta1 rods wi11 have a covering and this cover may be in the form of rollers, either solid or individual that woulcl rotate on the spokes by way of friction if enough friction were applied.
The height of the construction is unlimited and the unit shown may be stacked repeatedly as desired.
S The diameter of the hole in the centre, its only purpose is to allow the film to pass through the openings from the die to the top nip.
While in the drawings a bubble guide unit is shown having only four rods ~which, of course, are arranged at staggered distances from the plane of the rings 10 and 11, in order not to interfere with ea~h other, more rods may be employed in a unit, so as to 10 form a more than four-sided pvlygon. The additional rods would also be staggered in di.stances from the ring-plane. There is naturally a practical limit to the number of rods employed, depending on the ring diameter.
Claims
1. A bubble guide unit comprising: two concentric frames, at least one of which rotates relative to the other, through which a blown film bubble passes; and at least four bubble guiding rods arranged symmetrically to each pivotally engage one frame at one end and to freely engage the other frame near its other end.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002216177A CA2216177A1 (en) | 1997-09-23 | 1997-09-23 | Adjustable bubble guide or cage |
| CA002229821A CA2229821C (en) | 1997-09-23 | 1998-02-18 | Adjustable bubble guide or cage |
| US09/032,582 US6059554A (en) | 1997-09-23 | 1998-02-27 | Adjustable bubble guide or cage |
| EP98116793A EP0906823B1 (en) | 1997-09-23 | 1998-09-05 | Adjustable bubble guide or cage |
| DE69810728T DE69810728T2 (en) | 1997-09-23 | 1998-09-05 | Adjustable blown film guide |
| AT98116793T ATE231062T1 (en) | 1997-09-23 | 1998-09-05 | ADJUSTABLE BLOWN FILM GUIDE |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002216177A CA2216177A1 (en) | 1997-09-23 | 1997-09-23 | Adjustable bubble guide or cage |
| US09/032,582 US6059554A (en) | 1997-09-23 | 1998-02-27 | Adjustable bubble guide or cage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2216177A1 true CA2216177A1 (en) | 1999-03-23 |
Family
ID=25679629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002216177A Abandoned CA2216177A1 (en) | 1997-09-23 | 1997-09-23 | Adjustable bubble guide or cage |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2216177A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007079899A1 (en) * | 2005-12-21 | 2007-07-19 | Windmöller & Hölscher Kg | Sizing cage adjustment |
-
1997
- 1997-09-23 CA CA002216177A patent/CA2216177A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007079899A1 (en) * | 2005-12-21 | 2007-07-19 | Windmöller & Hölscher Kg | Sizing cage adjustment |
| US8210837B2 (en) | 2005-12-21 | 2012-07-03 | Windmoeller & Hoelscher Kg | Sizing cage adjustment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |