IE62089B1 - Improvements in and relating to Packing Materials - Google Patents
Improvements in and relating to Packing MaterialsInfo
- Publication number
- IE62089B1 IE62089B1 IE136190A IE136190A IE62089B1 IE 62089 B1 IE62089 B1 IE 62089B1 IE 136190 A IE136190 A IE 136190A IE 136190 A IE136190 A IE 136190A IE 62089 B1 IE62089 B1 IE 62089B1
- Authority
- IE
- Ireland
- Prior art keywords
- film
- oil
- drum
- top film
- bubble sheet
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims abstract description 9
- 238000012856 packing Methods 0.000 title claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 71
- 239000004033 plastic Substances 0.000 claims abstract description 31
- 229920003023 plastic Polymers 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 19
- 239000000498 cooling water Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229920001169 thermoplastic Polymers 0.000 claims description 5
- 239000004416 thermosoftening plastic Substances 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000007666 vacuum forming Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract 6
- 239000010724 circulating oil Substances 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000013529 heat transfer fluid Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
-
- 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
- B29C35/002—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/0046—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by constructional aspects of the apparatus
- B32B37/0053—Constructional details of laminating machines comprising rollers; Constructional features of the rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- 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
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
- B29C2035/042—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids other than water
- B29C2035/043—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids other than water oil
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
- B32B2553/02—Shock absorbing
- B32B2553/026—Bubble films
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
Abstract
A plastics bubble sheet (2) of packing material is manufactured by leading a flat plastics top film (10) from a top film storage reel (12) over a top film heating roller (19) where it is heated to a plastic state and then lead to a drum (5). Pockets (3) are formed in the top film (10) at the drum (5). A flat plastics backing film (11) is lead from a backing film storage reel (13) over backing film heating rollers (20) and then to the drum (5). At the drum (5) the backing film (11) is overlaid on the top film (10) and heat fused to the top film (10) sealing the pockets to form the bubble sheet (2). The temperatures of the heating rollers (19, 20) are regulated to within preset temperature limits by circulating oil through the heating rollers (19, 20). Oil temperature is controlled by passing the oil through an oil heater (23) and an oil cooler (26) and selectively operating the oil heater (23) and/or oil cooler (26) (Figure 3 not shown). The openings in the drum may be flared or bevelled at their outer end (Figures 4 and 5 - not shown).
Description
Improvements in and relating to packing materials
This invention relates to a process for producing a plastics bubble sheet of packing material.
In a known process a plastics bubble sheet is formed by 5 heating a flat plastics top film on heating rollers to it's thermoplastic temperature and then delivering the heated top film to a pocket forming station. This pocket forming station is a rotatable cylindrical drum having a plurality of openings. The openings communicate with the drum interior which is under vacuum. Vacuum draws the top film into the openings to form a number of pockets in the top film. A flat plastics backing film is also heated to it's thermoplastic temperature on heating rollers. The backing film is then led to the drum and overlaid on the top film, the films being heat fused to seal the pockets and thus form the bubble sheet. As soon as it has been formed the bubble sheet is cooled.
It is known to regulate the temperature of the heating rollers by circulating a heating oil through the heating rollers and through an oil heater. Electric colls in the oil heater heat the oil to the required temperature. The coils are switched
9' on and off as required. A disadvantage of this type of heater is the slow response time which makes accurate temperature control difficult. When the coils are switched off they will continue to give out heat for a period until the coils cool down. When switched on there is delay until the coils heat up fully. This presents difficulties in relation to accurately regulating the temperature of the heating oil, and hence the heating rollers, to within desired temperature limits. The problem is particulary acute during start-up of the process or when altering the output of the process as the feed rate of the plastics films and hence the required heat input will be varied until the apparatus has settled at the required production speed.
Another problem with known arrangements is that the outer edge of each opening where it meets an outer surface of the drum sidewall forms a relatively sharp shoulder. At higher operating speeds, this can cause the top film to tear as it is drawn into the opening by the vacuum within the drum. The production speed is therefore limited somewhat by the need to maintain a speed slow enough to avoid tearing the top film.
The present invention is directed towards overcoming these problems.
According to the invention there is provided a process for manufacturing a plastics bubble sheet of packing material from
- 3 two flat thermoplastics films, namely a top film and a backing film, comprising the steps of:
leading the top film from a top film storage reel over a number of top film heating rollers, heating the top film to a plastic state on the top film heating rollers, leading the heated top film to a pocket forming station, vacuum forming a plurality of pockets in the top film at the pocket forming station, delivering the top film to a fusing station, leading a backing film from a backing film storage reel over a number of backing film heating rollers, heating the backing film to a plastic state on the backing film heating rollers, leading the heated backing film to the fusing station, overlying the backing film on the top film at the fusing station, heat fusing the backing film to the top film to seal the pockets, thus forming the bubble sheet, immediately cooling the bubble sheet with bubble sheet cooling means, reeling the bubble sheet onto a bubble sheet storage roll, and characterised in that the top film heating rollers and the bottom film heating rollers are heated by circulating a heating oil through the rollers, the temperature of the heating oil being regulated by selectively circulating the heating oil through an electric coil type oil heater and an oil cooler, wherein the cooler uses water for cooling the oil and the process includes controlling the flow of cooling water through the cooler for regulating the temperature of the oil.
In a particularly preferred embodiment of the invention the pocket forming station comprises a rotatable cylindrical drum having a plurality of openings in its curved side wall communicating with an evacuated interior of the drum, the openings being flared outwardly at their outer ends.
Preferably the process includes the step of sensing the temperature of the oil with sensing means and controlling the flow of cooling water through the cooler in response to the sensed oil temperature.
In another embodiment control of the cooling water flow is carried out by operating a cooling water flow control valve upstream of the cooler in response to the sensed oil temperature, the flow control valve regulating the amounts of cooling water being delivered through the cooler and bypassing the cooler.
In another aspect of the invention there is provided a packing material comprising a plastics bubble sheet produced by the process described above.
In another aspect of the invention there is provided an apparatus for producing a plastics bubble sheet according to the process, the apparatus comprising a number of top film heating rollers, a number of backing film heating rollers, an electric coil type oil heater and an oil cooler, means for circulating a heating oil through the top film heating rollers and the backing film heating rollers and for selectively circulating the oil through the electric coil type oil heater and the oil cooler, a cylindrical drum to form pockets in the top film and act as a fusing station, the drum having a plurality of openings communicating with an interior of the drum, an outer end of each opening being flared outwardly, vacuum means to apply a vacuum to the drum interior, cooling means to cool a bubble sheet formed on the drum in use, a top film storage reel, means to deliver the top film from the top film storage reel to the drum via the top film heating rollers, a backing film storage reel, means to deliver the backing film from the backing film storage reel to the drum via the backing film heating rollers, a storage roll for bubble film, and means to reel cooled bubble film formed in use at the drum onto the storage roll. Preferably the outer end of each opening in the drum sidewall has an arcuate surface. Alternatively the outer end may be bevelled.
The invention will be more clearly understood from the following description of an embodiment thereof, given by way of example only, with reference to the accompanying drawings in which :
Fig. 1 is a diagrammatic side view of an apparatus for producing a plastics bubble sheet of packing material according to the invention,
Fig. 2 is a cross-sectional view of a plastics bubble sheet formed by the apparatus of Fig. 1,
Fig. 3 is a schematic diagram of an oil heating circuit and cooling water circuits forming portion of the apparatus.
Fig. 4 is a diagrammatic detail cross-sectional view through part of a drum forming portion of the apparatus,
Fig. 5 is a view similar to Fig. 4 showing part of another drum, and
Fig. 6 is a view similar to Fig. 4 showing portion of a another, conventional drum.
Referring to the drawings there is illustrated an apparatus indicated generally by the reference numeral 1 for producing a sheet of packing material comprising a plastics bubble sheet indicated generally by the reference numeral 2 with air bubbles 3. The apparatus 1 has a rotatable cylindrical drum
forming a die. Vacuum means comprising a vacuum pump (not shown) is provided for applying a vacuum to an interior portion 6 of the drum 5. The apparatus 1 has conventional means for continuously leading two flat thermoplastics films, namely, a top film 10 and a backing film 11 from a top film storage reel 12 and a backing film storage reel 13 to the drum 5 to form the plastics bubble sheet 2, and to deliver the plastics bubble sheet 2 onto a storage roll 16.
Heating means is provided to heat the top film 10 and backing film 11 prior to their delivery to the drum 5, and include a pair of top film heating rollers 19 for the top film 10, and backing film heating rollers 20 for the backing film 11. The heating rollers 19,20 form portion of a heating circuit indicated generally by the reference numeral 21 (see Fig. 3).
The heating circuit 21 has a pump 22 to circulate heating oil which acts as a heat transfer fluid through an oil heater 23 and the heating rollers 19, 20 which are hollow. The oil heater 23 has a number of electric heating coils for heating the oil. An oil storage tank 25 is connected to the heating circuit 21 for topping up any oil losses. An oil cooler 26 is also provided in the heating circuit 21, the oil cooler 26 being supplied with cooling water delivered by a pump 27 from a well 28 through a pipe 29 to the oil cooler 26. Downstream of the oil cooler 26 the cooling water is discharged to waste.
A water flow control valve 30 is provided in the pipe 29 upstream of the oil cooler 26 to regulate the amount of water delivered through the oil cooler 26 and is operable to allow water flow through the oil cooler 26 or bypass the cooler 26 through an associated water bypass pipe 31. A radiator 34 is mounted in the pipe 29 upstream of the oil cooler 26 to cool air delivered across the radiator 34 by an associated fan 35 and onto the bubble sheet 2 on the drum 5.
Cooling means to cool a bubble sheet formed on the drum 5 in use is provided and in addition to the fan 35 comprises a bubble sheet cooling circuit indicated generally by the reference numeral 40. The bubble sheet cooling circuit 40 has a pump 41 for circulation of bubble sheet cooling water through a chiller unit 42 to cool the water and through rotatable bubble sheet cooling rollers 43 which cool the bubble sheet 2 and guide the bubble sheet 2. The cooling circuit 40 also includes a plate type pre-cooler 45 having a primary side 46 connected in the water pipe 29 and a secondary side 47 connected in the cooling circuit 40.
Referring now in particular to Fig. 4 the drum 5 has a sidewall 50 with an inner face 51 and an outer face 52. A plurality of openings 53 are provided in the sidewall 50 communicating with an interior of the drum 5. It will be noted that an outer end 55 of each opening 53 has an arcuate surface which flares outwardly. Housed within the drum 5 and seated against the inner face 51 of the sidewall 50 is a tubular mesh 56.
Referring now to Fig. 5 this shows portion of an alternative drum having a sidewall 60 with openings 61 each having a bevelled outer end 62. Fig. 6 shows a conventional drum construction having a sidewall 70 with a plurality of openings
71, each opening 71 having a substantially squared outer end
72.
In use, the process for forming the bubble sheet 2 is carried out by leading the top film 10 from the top film storage reel 12 to the top film heating rollers 19. In passing around the rotating top film heating rollers 19 the top film 10 is heated to a plastic state. From the top film heating rollers 19 the top film 10 is led to the drum 5 which acts as a pocket forming station. Vacuum within the drum 5 draws the top film /
into the openings 53 of the drum sidewall 50 thus forming a plurality of pockets in the top film 10. The backing film is similarly led from the backing film storage reel 13 to the backing film heating rollers 20 where it is heated to a plastic state in passing around the backing film heating rollers 20. It is then led to a fusing station formed by portion of the drum 5 downstream of the pocket forming station where the backing film 11 is overlaid on the top film 10. At the fusing station the top film 10 and backing film 11 are heat fused together to seal the pockets thus forming the bubble sheet 2. As soon as the bubble sheet 2 is formed it is immediately cooled by means of the fan 35 which blows cool air onto the bubble sheet 2. Cooling is further assisted by means of the cooling rollers 43.
It will be noted that the flared arcuate outer end 55 of each opening 53 in the drum sidewall 50 provides a gradual lead-in to each opening 53 which helps prevent tearing of the bubble film 10.
The pump 41 circulates bubble sheet cooling water in the bubble sheet cooling circuit 40, the bubble sheet cooling water entering the bubble sheet cooling rollers 43 at a temperature of about 12°C and leaving the bubble sheet cooling rollers 43 at a temperature of about 16°C. The temperature of the bubble sheet cooling water is partially lowered in the pre-cooler 45 and then reduced to 12°C in the chiller unit 42.
The oil pump 22 circulates hot oil through the heating rollers 19, 20 at a temperature of 110-170°C depending on parameters such as the thickness of the plastic film being used and the speed of the films over the heating rollers 19, 20. As the oil heater 23 uses electric heating coils these will continue to radiate heat even when switched off and may cause excessive heating of the oil. Fine control of the oil temperature is achieved by regulating the flow of cooling water through the oil cooler 26 by means of the water flow control valve 30 which operates in response to the sensed oil temperature to control the flow of cooling water through the oil cooler 26.
Accurate regulation of the heating oil temperature and hence the temperature of the heating rollers is of critical importance for efficient operation of the process. Any under temperature can lead to inadequate fusing of the two plastics f i 1ms - Over-temperature of the heating rollers can weaken the plastics films which may be stretched giving an inferior quality bubble sheet, or possibly even tom which interrupts the operation of the process resulting in lower production rates. Over-temperature may also cause the plastics films to stick to the heating rollers which again can lend to tearing of the plastics films.
It will be appreciated that the process allows control of the heating oil temperature to be readily easily and quickly achieved over a wide range of temperatures and heat transfer rates with easier and less troublesome operation of the apparatus.
The invention is not limited to the embodiment hereinbefore described which may be varied in both construction and detail.
Claims (9)
1. A process for manufacturing a plastics bubble sheet of packing material from two flat thermoplastics films, namely a top film and a backing film, comprising the 5 steps of; leading the top film from a top film storage reel over a number of top film heating rollers, heating the top film to a plastic state on the top film heating rollers, 10 leading the heated top film to a pocket forming station, vacuum forming a plurality of pockets in the top film at the pocket forming station, delivering the top film to a fusing station, 15 leading a backing film from a backing film storage reel over a number of backing film heatincf rollers, heating the backing film to a plastic state on the backing film heating rollers, -14leading the heated backing film to the fusing station, overlying the backing film on the top film at the fusing station, heat fusing the backing film to the top film to seal the pockets, thus forming the bubble sheet, immediately cooling the bubble sheet with bubble sheet cooling means, and reeling the bubble sheet onto a bubble sheet storage roll, and characterised in that the top film heating rollers and the bottom film heating rollers are heated by circulating a heating oil through the rollers, the temperature of the heating oil being regulated by selectively circulating the heating oil through an electric coil type oil heater and an oil cooler, wherein the cooler uses water for cooling the oil and the process includes controlling the flow of cooling water through the cooler for regulating the temperature of the oil.
2. A process as claimed in claim 1, wherein the pocket forming station comprises a rotatable cylindrical drum having a plurality of openings in its curved side wall communicating with an evacuated interior of the drum, the openings being flared outwardly at their outer ends. -153. A process as claimed in claim 1 or claim 2 including the step of sensing the temperature of the oil with sensing means and controlling the flow of cooling water through the cooler in response to the sensed oil temperature.
3. 4. A process as claimed in claim 3 wherein control of the cooling water flow is carried out by operating a cooling water flow control valve upstream of the cooler in response to the sensed oil temperature, the flow control valve regulating the amounts of cooling water being delivered through the cooler and bypassing the cooler.
4. 5. A plastics bubble sheet produced by the process as claimed in any preceding claim.
5. 6. An apparatus for producing a plastics bubble sheet according to the process as claimed in any of claims 1 to 5, the apparatus comprising a number of top film heating rollers, a number of backing film heating rollers, an electric coil type oil heater and an oil cooler, means for circulating a heating oil through the top film heating rollers and the backing film heating rollers and for selectively circulating the oil through the electric coil type oil heater and the oil cooler, a cylindrical drum to form pockets in the top film and act as a fusing station, the drum having a plurality of openings communicating with an interior of the drum, an outer end of each opening being flared outwardly, vacuum means to apply a vacuum to the drum interior, cooling means to cool a bubble sheet formed on the drum in use, a top film storage reel, means to deliver the top film from the top film storage reel to the drum via the top film heating rollers, a backing film storage reel, means to deliver the backing film from the backing film storage reel to the drum via the backing -16film heating rollers, a storage roll for bubble film, and means to reel cooled bubble film formed in use at the drum onto the storage roll.
6. 7. An apparatus as claimed in claim € wherein the outer 5 end of each opening in the drum sidewall has an arcuate surface.
7. 8. An apparatus as claimed in claim 6 wherein the outer end of each opening in the drum sidewall is bevelled.
8. 9. A plastics bubble sheet whenever produced by the
9. 10 apparatus as claimed in any of claims 6 to 8.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE136190A IE62089B1 (en) | 1990-04-18 | 1990-04-18 | Improvements in and relating to Packing Materials |
| GB9018098A GB2243109B (en) | 1990-04-18 | 1990-08-17 | Improvements in and relating to packing materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE136190A IE62089B1 (en) | 1990-04-18 | 1990-04-18 | Improvements in and relating to Packing Materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE901361A1 IE901361A1 (en) | 1991-10-23 |
| IE62089B1 true IE62089B1 (en) | 1994-12-14 |
Family
ID=11026074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE136190A IE62089B1 (en) | 1990-04-18 | 1990-04-18 | Improvements in and relating to Packing Materials |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2243109B (en) |
| IE (1) | IE62089B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7252650B1 (en) | 1996-08-02 | 2007-08-07 | Ranier Limited | Balloon catheter |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3019487B1 (en) * | 2014-04-07 | 2016-12-02 | Air Liquide France Ind | METHOD AND INSTALLATION FOR MANUFACTURING BUBBLE FILMS |
| FR3019488B1 (en) * | 2014-04-07 | 2016-04-01 | Air Liquide France Ind | METHOD AND INSTALLATION FOR MANUFACTURING BUBBLE FILMS USING A CONTROLLED TEMPERATURE FILLING GAS |
| CN108773145B (en) * | 2015-12-27 | 2019-12-31 | 乐清市川嘉电气科技有限公司 | Heating device of laminator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1418395A (en) * | 1963-11-19 | 1965-11-19 | Method and apparatus for making sheets of cellular material | |
| JPS5436617B2 (en) * | 1973-02-07 | 1979-11-10 | ||
| JPS615923A (en) * | 1984-06-20 | 1986-01-11 | Kawakami Sangyo Kk | Manufacturing device for synthetic resin hollow body |
-
1990
- 1990-04-18 IE IE136190A patent/IE62089B1/en not_active IP Right Cessation
- 1990-08-17 GB GB9018098A patent/GB2243109B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7252650B1 (en) | 1996-08-02 | 2007-08-07 | Ranier Limited | Balloon catheter |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2243109B (en) | 1994-02-23 |
| IE901361A1 (en) | 1991-10-23 |
| GB2243109A (en) | 1991-10-23 |
| GB9018098D0 (en) | 1990-10-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK9A | Patent expired |