EP0375727A4 - Improved aerosol container closure - Google Patents

Improved aerosol container closure

Info

Publication number
EP0375727A4
EP0375727A4 EP19880907914 EP88907914A EP0375727A4 EP 0375727 A4 EP0375727 A4 EP 0375727A4 EP 19880907914 EP19880907914 EP 19880907914 EP 88907914 A EP88907914 A EP 88907914A EP 0375727 A4 EP0375727 A4 EP 0375727A4
Authority
EP
European Patent Office
Prior art keywords
mounting cup
gasket
temperature
bonding material
gasket material
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.)
Granted
Application number
EP19880907914
Other versions
EP0375727A1 (en
EP0375727B1 (en
Inventor
Robert H. Abplanalp
Barry M. Connell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE19883885759 priority Critical patent/DE3885759T2/en
Publication of EP0375727A1 publication Critical patent/EP0375727A1/en
Publication of EP0375727A4 publication Critical patent/EP0375727A4/en
Application granted granted Critical
Publication of EP0375727B1 publication Critical patent/EP0375727B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/38—Details of the container body

Definitions

  • Aerosol dispensing containers have found widespread use in the packaging of fluid materials including a variety of both liquid and powdered particulate products. Such containers are provided with a valve-controlled discharge orifice and operate by the action of a volatile propellant which is confined within the container together with the product to be dispensed. Because the propellant has an appreciable vapor pressure at room temperature, the product in the closed container is maintained under super-atmospheric pressure.
  • a typical aerosol unit comprises a hollow cylindrical container which is tightly closed at one end and is provided with an opening at its opposite end for receiving a dispensing valve assembly.
  • a closure commonly referred to as a mounting cup, serves as the closure for the container and as a support for the valve assembly.
  • the mounting cup comprises a panel portion having an aperture for receiving the valve unit, a skirt portion depending from the periphery of the panel, and an annular channel portion extending outwardly from the edge of the skirt.
  • mounting cup seals have been formed by disposing a so-called "cut" gasket in the channel.
  • This type of gasket has the disadvantage of not being stationary relative to the mounting cup during propellant filling or other valve unit assembly operations with the undesirable consequence that when the mounting cup and container are clinched to effect the seal, the gasket is often disposed at an angled position, and thus, the seal may be less effective.
  • Another commercial method for disposing the gasket onto the mounting cup consists in forming the gaskets in situ from liquid gasket-forming compositions comprising an elastomer dispersed or dissolved in volatile liquid vehicles, so called “flowed-in" gasket.
  • the liquid composition is deposited in the desired configuration in the channel of the cup while the cup is rotated beneath a metering nozzle through which the gasket composition flows. The deposit is then converted into a dry solid sealing mass by expelling the liquid vehicle at elevated temperatures.
  • the method of the invention of the aforesaid United States Patent Nos. 4,546,525 and 4,547,948 comprises passing a tubular sleeve of gasket material onto a compressible mandrel; initially positioning and aligning the skirt of the mounting cup and the contiguous end of the mandrel such that the sleeve of gasket material may pass onto the skirt, said mandrel having fixed and moveable portions with respect to each other and to their movement toward and away from the mounting cup; urging the moveable portion of the gasket material bearing mandrel toward the mounting cup such that the gasket material passes onto the skirt of the cup; causing the moveable portion of the mandrel to retract to its initial position, cutting the sleeve at a point between the mounting cup and the mandrel to leave a band of gasket material; and subsequently, advancing the mounting cup to a station whereat the band of the gasket material is urged further onto the skirt of the mounting cup, whereby, the band of gasket
  • the gasket is advanced to the ultimately desired position on the mounting cup.
  • the invention disclosed in United States Patent No. 4,559,198 comprises forming one or more compressive deformations in the band of gasket material.
  • the invention comprises a gasketed mounting cup having a temperature-activable bonding material between the surface of the gasket contiguous to the mounting cup and the mounting cup, which temperature-activable bonding material acts to adhere the gasket to the metal mounting cup; as well as the sub-combination of the gasket material and the temperature-activable bonding material, per se.
  • the temperature- activable bonding material is disposed in a stripe form on the surface of the gasket material.
  • the temperature-activable bonding material must have a temperature-activated range such that it will be non-tacky or non-adhering to the mounting cup during initial placement on the mounting cup and convert to a tacky or adhering state when the gasket material is disposed in its ultimate position on the mounting cup.
  • the stripe of temperature-activable bonding material is shaped so as to form an apex of the bonding material furthest away from the gasket material.
  • Figure 1 is a partial sectional view of the gasketed aerosol mounting cup showing the gasket and bonding material in a partially advanced position on the skirt of the mounting cup.
  • Figure 2 is a partial sectional view of the apparatus used to advance the gasket and bonding material from an initial position on the mounting cup to its ultimate position on the mounting cup.
  • Figure 3 is an enlargement of the circled portion of Figure 2.
  • Figure 4 is a plan view of the gasket material of this invention.
  • Figure 5 is an enlargement of the circled portion of Figure 4.
  • Figure 1 shows the position of the gasket on the mounting cup at an initial stage of advance.
  • the gasket may be initially positioned on the mounting cup in accordance with the method and apparatus described in United States Patent No. 4,559,198, at Figures 1-10 and the description in said patent referring to said Figures, which Figures and description is incorporated into and made a part of the description of this invention.
  • the mounting cup is passed on conventional tracking through a zone wherein the band of gasket and bonding material is heated by conventional heating means through heat exchange with the mounting cup.
  • the heating zone is a conventional mounting cup tracking in indirect heat exchange with an insulated heated water system, said water system being capable of close control through heated water control systems. Heating the mounting cup to a temperature of 200-225F 0 , preferrably a temperature of 218-225°F has been found satisfactory.
  • the mounting cup is heated by a conventional radio frequency system (RF.)
  • the mounting cups are passed to a secondary plunger station for final positioning of the gasket.
  • the plunger for advancing the gasket at the secondary plunger station is shown in Figure 2.
  • the plunger of Figure 2 generally designated as 120, comprises an outside sleeve portion 122, a head portion 124, a chuck portion 126, which chuck portion is attached to a plunger advancing mechanism (not shown) , the head portion 124 and sleeve portion 122 defining a recess 128.
  • a mounting cup stripping member generally designated as 130, which comprises slidably mating portions 132 and 134, and a mounting cup centering member, 136, which centering member 136 is biased away from the head portion 124 by a spring 138.
  • Mating portion 132 of the mounting cup stripping member 130 is biased away from the head portion 124 by a spring 140.
  • Mating portion 134 of the mounting cup stripping member 130 is biased away from mating portion 132 by spring 142.
  • the sleeve 122 has a lower portion 144 having an annular shoulder 146.
  • the shoulder portion 146 engages the gasket material 116 while advancing the gasket to its ultimate position on the mounting cup 118.
  • the mounting cups 118 are suitably placed at the secondary plunger station.
  • the plunger 120 is advanced toward the mounting cup 118 by centering the cup relative to the plunger 120, the mounting cup centering member 136 serving this function.
  • the mounting cup stripping member 130 is brought into contact with the cup, as shown in Figure 2.
  • the sleeve 122 moves to engage the shoulder 146 against the gasket material 116 and urge the gasket material 116 further onto the skirt of the mounting cup 118, ultimately advancing the gasket material to the final position shown in Figure 2.
  • the edge 148 of the sleeve 122 terminates its advance by bottoming against the walls 152 of the channel of the mounting cup.
  • the mating portion 134 of the mounting cup stripping member 130 is biased against the mounting cup 118 by the spring 142 until such time as the sleeve 122 moves clear of the advanced gasket, thus precluding the retracting sleeve 122 from lifting the mounting cup 118.
  • the springs 140 and 142 must be designed to permit mating portion 132 to advance toward mating portion 134 during the advance of the plunger 120.
  • the gasketed mounting cup is cooled to room temperature.
  • the inside diameter of the gasket material is slightly less than the outside diameter of the skirt portion of the mounting cup.
  • the gasket material bearing the temperature- activable bonding material is ideally extruded in continuous tubular form.
  • the temperature-activable bonding material may be used in conjunction with a pre-formed band of gasket material and thereafter applied to the mounting cup as individual bands of gasket material.
  • the gasket material bearing the temperature-activable bonding material for adhering the gasket and mounting cup is disposed on the inner surface of the gasket material and is manufactured utilizing conventional coextrusion or other methods of application.
  • the bonding material may be applied to the entire surface of the gasket material that is contiguous to the mounting cup, but is preferably disposed in stripe form on the gasket, and more preferably formed as stripes having an apex in that portion of the bonding material distal to the gasket material. It is preferable that a plurality of stripes be used and that the stripes be uniformly distributed on the gasket material. It has been found that using six stripes provides an effective bonding of gasket and mounting cup.
  • Figure 4 shows the gasket material of this invention having the stripes 10 disposed on the inner surface 11 of the gasket material, generally designated as 12.
  • Figure 5 shows in enlarged detail the preferred shape of the stripes of bonding material. Note the formation of the apex 13 in the bonding material distal to the gasket material 12. It is believed that by providing an apex in the stripes of bonding material that the heat transfer from the heated mounting cup to the temperature-activable bonding material is best controlled and maximized.
  • the temperature-activable material forming the bond between the gasket and mounting cup may result in the formation of an adhesive bond, a stronger interference fit between gasket and mounting cup, or a combination of both adhesion and interference fit.
  • temperature-activable bonding material may be any adhesive resin compatible with the gasket material chosen and other components and product of the aerosol container, it has been found that BYNELTM CXA 2002 (a trade arked product sold by E.I. Du Pont De Nemours & Co, (Inc.) is preferable for use with the aforesaid polyethylene gasket material.
  • BYNEL CXA 2002 is an ethylene terpolymer containing a temperature stable ester in combination with high acid functionality. Typical property data for BYNEL CXA 2002 is as follows:
  • the temperature-activable bonding material have the capability of being converted to the bonding state at a temperature below the distortion temperature of the gasket material.
  • the temperature that converts the bonding material to the bonding state is at or near that generated by the heated mounting cup when the gasket is at its ultimate position on the mounting cup, so as not to deposit said substance onto the skirt portion of the mounting cup as the gasket is advanced to its ultimate position during the secondary plunger action.
  • That aspect of the subject invention regarding disposing the temperature-activable bonding material in striped form on the surface of the gasket material; and more preferably in striped form with an apex distal to the gasket material surface has utility in bonding materials generally.
  • the striped form may be used to bond a laminate of plastic material to a metal or other surface.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Closures For Containers (AREA)

Description

IMPROVED AEROSOL CONTAINER CLOSURE Background
Aerosol dispensing containers have found widespread use in the packaging of fluid materials including a variety of both liquid and powdered particulate products. Such containers are provided with a valve-controlled discharge orifice and operate by the action of a volatile propellant which is confined within the container together with the product to be dispensed. Because the propellant has an appreciable vapor pressure at room temperature, the product in the closed container is maintained under super-atmospheric pressure.
A typical aerosol unit comprises a hollow cylindrical container which is tightly closed at one end and is provided with an opening at its opposite end for receiving a dispensing valve assembly. A closure, commonly referred to as a mounting cup, serves as the closure for the container and as a support for the valve assembly. Typically, the mounting cup comprises a panel portion having an aperture for receiving the valve unit, a skirt portion depending from the periphery of the panel, and an annular channel portion extending outwardly from the edge of the skirt. When the mounting cup is placed in sealing position on the container, the channel is positioned over the bead surrounding the container opening and the lower portion of the skirt adjacent to the channel is flared or clinched outwardly against the container wall adjacent the bead. To ensure adequate sealing between the closure and the container, the cup is provided with a gasket in the channel , or predominantly in the channel of the cup.
Heretofore, mounting cup seals have been formed by disposing a so-called "cut" gasket in the channel. This type of gasket has the disadvantage of not being stationary relative to the mounting cup during propellant filling or other valve unit assembly operations with the undesirable consequence that when the mounting cup and container are clinched to effect the seal, the gasket is often disposed at an angled position, and thus, the seal may be less effective.
Another commercial method for disposing the gasket onto the mounting cup consists in forming the gaskets in situ from liquid gasket-forming compositions comprising an elastomer dispersed or dissolved in volatile liquid vehicles, so called "flowed-in" gasket. In the manufacture of such a gasket, the liquid composition is deposited in the desired configuration in the channel of the cup while the cup is rotated beneath a metering nozzle through which the gasket composition flows. The deposit is then converted into a dry solid sealing mass by expelling the liquid vehicle at elevated temperatures. Though this technique of flowing gaskets into place has received wide commercial acceptance, it suffers from the disadvantages of requiring an elaborate drying operation, wherein the mounting cup must be handled carefully so as to avoid undue upset from the horizontal; costly recovery apparatus for the expelled liquid also must be provided. In sum, the flowed-in gasket is an expensive step in the formation of the mounting cup. See United States Patent No. 3,342,381 as an example of the "flowed-in" gasket.
Other techniques for disposing a gasket onto the mounting cup are described in United States Patent No. 3,417,177, wherein the gasket seal is made of heat shrinkable material. After placing a band of gasket material on the skirt, the gasket having a greater diameter than the outside diameter of the skirt of the mounting cup, the cup is heated at a temperature and for a time sufficient to shrink the band into tight frictional engagement with the skirt. Another similar technique is that disclosed in United States Patent No. 3,443,006, wherein a band of gasket material is swelled through the use of a suitable swelling agent so as to increase its diameter to fit over the skirt of the mounting cup. Subsequently, the swelling agent is removed from the gasket material so that the band will come into tight frictional engagement with the skirt.
Both the heat shrink and swelling techniques for applying a gasket material to the mounting cup have the disadvantage of being costly and relatively time consuming procedures. Note in U.S. 3,417,177, column 4. lines 27-31, that the positioned bands must be heated to 240°F for about 2-3 minutes in order to obtain a tight friction fit. In the procedure of 3,443,006, the bands must stand in the swelling liquid for a period of 1/2 to 1-1/2 minutes according to example 2 of the '006 patent and then allowed to stand for the drying period. Also, in any mass production utilizing the '006 system, an organic liquid recovery system must be employed.
In the United States Patent Nos. 4,546,525 and 4,547,948 is described a novel gasketed mounting cup system, including novel method and apparatus, wherein the gasket material is disposed on the mounting cup in the preferred position for effecting a seal between the mounting cup and the bead of the container; and further wherein the disadvantages associated with the aforementioned techniques of applying the gasket material to the cup are obviated. Also, an apparatus and method is provided wherein gaskets are applied to aerosol mounting cups in an exceptionally rapid and efficient manner to form gasketed-mounting cups having excellent sealing characteristics.
In general, the method of the invention of the aforesaid United States Patent Nos. 4,546,525 and 4,547,948 comprises passing a tubular sleeve of gasket material onto a compressible mandrel; initially positioning and aligning the skirt of the mounting cup and the contiguous end of the mandrel such that the sleeve of gasket material may pass onto the skirt, said mandrel having fixed and moveable portions with respect to each other and to their movement toward and away from the mounting cup; urging the moveable portion of the gasket material bearing mandrel toward the mounting cup such that the gasket material passes onto the skirt of the cup; causing the moveable portion of the mandrel to retract to its initial position, cutting the sleeve at a point between the mounting cup and the mandrel to leave a band of gasket material; and subsequently, advancing the mounting cup to a station whereat the band of the gasket material is urged further onto the skirt of the mounting cup, whereby, the band of gasket material does not extend beyond the skirt of the mounting cups.
Subsequently, the gasket is advanced to the ultimately desired position on the mounting cup.
For certain applications of the gasketed mounting cups of United States Patents Nos. 4,546,525 and 4,547,948, namely, utilizing said mounting cups in so-called, "under the cup" propellant filling of the container, it was observed that on limited occasions the gasket band was displaced from the desired position on the mounting cup during the filling operation.
An improvement in the method and apparatus utilized in United States Patent Nos. 4,546,525 and 4,547,948 and the cup produced thereby was provided by the invention disclosed in United States Patent No. 4,559,198.
The invention disclosed in United States Patent No. 4,559,198 comprises forming one or more compressive deformations in the band of gasket material.
While the invention of United States Patent No. 4,559,198 provided an improvement in stabilizing the gasket material on the mounting cup during "under the cup" propellant filling, some problem remained with stabilizing the gasket relative to the desired position on the mounting cup, engendered, in part, by the variable conditions encountered during the propellant filling operations.
Summary of the Invention
Broadly stated in its relation to an aerosol container closure, the invention comprises a gasketed mounting cup having a temperature-activable bonding material between the surface of the gasket contiguous to the mounting cup and the mounting cup, which temperature-activable bonding material acts to adhere the gasket to the metal mounting cup; as well as the sub-combination of the gasket material and the temperature-activable bonding material, per se. In a particular and preferred embodiment the temperature- activable bonding material is disposed in a stripe form on the surface of the gasket material. Preferably, the temperature-activable bonding material must have a temperature-activated range such that it will be non-tacky or non-adhering to the mounting cup during initial placement on the mounting cup and convert to a tacky or adhering state when the gasket material is disposed in its ultimate position on the mounting cup. In a still more particular and more preferred form, the stripe of temperature-activable bonding material is shaped so as to form an apex of the bonding material furthest away from the gasket material. The present invention will be more clearly understood by referring to the drawings herein and the discussion relating thereto.
In the drawings:
Figure 1 is a partial sectional view of the gasketed aerosol mounting cup showing the gasket and bonding material in a partially advanced position on the skirt of the mounting cup.
Figure 2 is a partial sectional view of the apparatus used to advance the gasket and bonding material from an initial position on the mounting cup to its ultimate position on the mounting cup.
Figure 3 is an enlargement of the circled portion of Figure 2.
Figure 4 is a plan view of the gasket material of this invention.
Figure 5 is an enlargement of the circled portion of Figure 4.
Description of the Invention
Figure 1 shows the position of the gasket on the mounting cup at an initial stage of advance.
The gasket may be initially positioned on the mounting cup in accordance with the method and apparatus described in United States Patent No. 4,559,198, at Figures 1-10 and the description in said patent referring to said Figures, which Figures and description is incorporated into and made a part of the description of this invention.
Subsequent to the initial advance of the gasket material onto the skirt of the mounting cup, the mounting cup is passed on conventional tracking through a zone wherein the band of gasket and bonding material is heated by conventional heating means through heat exchange with the mounting cup. For example, the heating zone is a conventional mounting cup tracking in indirect heat exchange with an insulated heated water system, said water system being capable of close control through heated water control systems. Heating the mounting cup to a temperature of 200-225F0, preferrably a temperature of 218-225°F has been found satisfactory. Alternatively, and preferably, the mounting cup is heated by a conventional radio frequency system (RF.)
From the heating zone the mounting cups are passed to a secondary plunger station for final positioning of the gasket. The plunger for advancing the gasket at the secondary plunger station is shown in Figure 2.
The plunger of Figure 2, generally designated as 120, comprises an outside sleeve portion 122, a head portion 124, a chuck portion 126, which chuck portion is attached to a plunger advancing mechanism (not shown) , the head portion 124 and sleeve portion 122 defining a recess 128. Within the recess 128 is a mounting cup stripping member, generally designated as 130, which comprises slidably mating portions 132 and 134, and a mounting cup centering member, 136, which centering member 136 is biased away from the head portion 124 by a spring 138. Mating portion 132 of the mounting cup stripping member 130 is biased away from the head portion 124 by a spring 140. Mating portion 134 of the mounting cup stripping member 130 is biased away from mating portion 132 by spring 142.
The sleeve 122 has a lower portion 144 having an annular shoulder 146. The shoulder portion 146 engages the gasket material 116 while advancing the gasket to its ultimate position on the mounting cup 118.
In operation, the mounting cups 118 are suitably placed at the secondary plunger station. When in place, the plunger 120 is advanced toward the mounting cup 118 by centering the cup relative to the plunger 120, the mounting cup centering member 136 serving this function. Also the mounting cup stripping member 130 is brought into contact with the cup, as shown in Figure 2. Upon advancing the plunger 120, the sleeve 122 moves to engage the shoulder 146 against the gasket material 116 and urge the gasket material 116 further onto the skirt of the mounting cup 118, ultimately advancing the gasket material to the final position shown in Figure 2. As shown in Figure 2, the edge 148 of the sleeve 122 terminates its advance by bottoming against the walls 152 of the channel of the mounting cup.
During retraction of the plunger 120, the mating portion 134 of the mounting cup stripping member 130 is biased against the mounting cup 118 by the spring 142 until such time as the sleeve 122 moves clear of the advanced gasket, thus precluding the retracting sleeve 122 from lifting the mounting cup 118. Obviously, the springs 140 and 142 must be designed to permit mating portion 132 to advance toward mating portion 134 during the advance of the plunger 120.
Preferably, following the advancement of the gasket material to its ulitmate position on the mounting cup, the gasketed mounting cup is cooled to room temperature.
To form a friction fit between gasket material and the skirt of the mounting cup, the inside diameter of the gasket material is slightly less than the outside diameter of the skirt portion of the mounting cup.
While any plastic gasket material having sufficient resiliency may be used provided that there is compatability between the container contents and the plastic material, it has been found that a plastic comprising linear low density polyethylene (density range of .916-.922) plus stablizers usually used with polyethylene in the environment in which the gasket material will reside, provides a satisfactory gasket material over a broad product range.
The gasket material bearing the temperature- activable bonding material is ideally extruded in continuous tubular form. However, it should be understood that the temperature-activable bonding material may be used in conjunction with a pre-formed band of gasket material and thereafter applied to the mounting cup as individual bands of gasket material.
Preferably, the gasket material bearing the temperature-activable bonding material for adhering the gasket and mounting cup is disposed on the inner surface of the gasket material and is manufactured utilizing conventional coextrusion or other methods of application. The bonding material may be applied to the entire surface of the gasket material that is contiguous to the mounting cup, but is preferably disposed in stripe form on the gasket, and more preferably formed as stripes having an apex in that portion of the bonding material distal to the gasket material. It is preferable that a plurality of stripes be used and that the stripes be uniformly distributed on the gasket material. It has been found that using six stripes provides an effective bonding of gasket and mounting cup.
Figure 4 shows the gasket material of this invention having the stripes 10 disposed on the inner surface 11 of the gasket material, generally designated as 12.
Figure 5 shows in enlarged detail the preferred shape of the stripes of bonding material. Note the formation of the apex 13 in the bonding material distal to the gasket material 12. It is believed that by providing an apex in the stripes of bonding material that the heat transfer from the heated mounting cup to the temperature-activable bonding material is best controlled and maximized.
The temperature-activable material forming the bond between the gasket and mounting cup may result in the formation of an adhesive bond, a stronger interference fit between gasket and mounting cup, or a combination of both adhesion and interference fit.
While the temperature-activable bonding material may be any adhesive resin compatible with the gasket material chosen and other components and product of the aerosol container, it has been found that BYNEL™ CXA 2002 (a trade arked product sold by E.I. Du Pont De Nemours & Co, (Inc.) is preferable for use with the aforesaid polyethylene gasket material.
BYNEL CXA 2002 is an ethylene terpolymer containing a temperature stable ester in combination with high acid functionality. Typical property data for BYNEL CXA 2002 is as follows:
Melt Index dg/min. , 10
ASTM D-1238 Density kg/m3 (g/cc) , 931 (0.931)
ASTM D-1505 Melting Point °C(°F), DSC 91 (196) Freezing Point °C(°F) DSC 66 (150) Vicat Softening Point °C 44 (111)
(°F) , ASTM D-1525 Tensile Strength mPa(psi) 47.8 (6940)
ASTM D-1708 Tensile Modulus mPa (psi) 22.3 (3240)
ASTM D-1708 1) Elongation at Break %, 730 ASTM D-1708
It is important that the temperature-activable bonding material have the capability of being converted to the bonding state at a temperature below the distortion temperature of the gasket material.
Preferably, the temperature that converts the bonding material to the bonding state is at or near that generated by the heated mounting cup when the gasket is at its ultimate position on the mounting cup, so as not to deposit said substance onto the skirt portion of the mounting cup as the gasket is advanced to its ultimate position during the secondary plunger action. That aspect of the subject invention regarding disposing the temperature-activable bonding material in striped form on the surface of the gasket material; and more preferably in striped form with an apex distal to the gasket material surface, has utility in bonding materials generally. For example, the striped form may be used to bond a laminate of plastic material to a metal or other surface.

Claims

What is Claimed:
1. In a gasketed mounting cup comprising a panel, a skirt integral with and depending from the periphery of said panel, said skirt being outwardly flared to form an annular channel for mating with the bead of a container opening and wherein the gasket material is disposed as a band on the skirt from below the clinch point into the channel, the improvement which comprises disposing a temperature- activable bonding material between the surface of the gasket material contiguous to the mounting cup, which temperature-activable bonding material assists in adhering the gasket to the mounting cup.
2. The improved gasketed mounting cup of claim 1, and further wherein the temperature-activable bonding material is disposed on the surface of the gasket material contiguous to the mounting cup by coextruding the gasket material and the temperature- activable bonding material.
3. The improved gasketed mounting cup of claim
1, and further wherein the temperature-activable bonding material is disposed between the gasket and the mounting cup in the form of a plurality of stripes.
4. The improved gasketed mounting cup of claim
2, and further wherein the temperature-activable bonding material is disposed on the surface of the gasket material contiguous to the mounting cup in the form of a plurality of stripes.
5. The improved gasketed mounting cup of claim 3, and further wherein the plurality of stripes disposed between the gasket material and the mounting cup are substantially equally spaced from each other.
6. The improved gasketed mounting cup of claim 3, and further wherein there is six stripes of temperature-activable bonding material evenly spaced on the gasket material.
7. A gasket material suitable for gasketing an aerosol mounting cup to a container bead and having an inner surface for bearing against the mounting cup comprising disposing a temperature-activable bonding material on the inner surface of the band of gasket material for adhering, at least in part, the gasket to the mounting cup.
8. The gasket material of claim 7, and further wherein the gasket material and temperature-activable bonding material are coextruded.
9. The gasket material of claim 7, and further wherein the temperature-activable bonding material is disposed on the inner surface of the gasket material in the form of a plurality of stripes.
10. The gasket material of claim 9, and further wherein the stripes of temperature-activable bonding material are shaped such that an apex of bonding material is formed in that portion of the stripe furthest from the gasket material.
11. The gasket material of claim 9, and further wherein the stripes of temperature-activable bonding material are evenly spaced on the inner surface of the gasket material.
12. The gasket material of claim 11, and further wherein the stripes of temperature-activable bonding material are shaped such that an apex of bonding material is formed in that portion of the stripe furthest from the gasket material.
13. An article having at least two layers to be bonded comprising disposing a temperature-activable bonding material between the layers in the form of a plurality of stripes.
14. The article of claim 13 and further wherein one of the bondable layers is a metal.
15. The article of claim 14 and further wherein the stripe of bonding material has an apex contiguous to the metal surface.
EP88907914A 1987-05-07 1988-06-22 Improved aerosol container closure Expired - Lifetime EP0375727B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19883885759 DE3885759T2 (en) 1988-06-22 1988-06-22 CAP FOR AEROSOL CONTAINERS.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4723587A 1987-05-07 1987-05-07

Publications (3)

Publication Number Publication Date
EP0375727A1 EP0375727A1 (en) 1990-07-04
EP0375727A4 true EP0375727A4 (en) 1990-12-05
EP0375727B1 EP0375727B1 (en) 1993-11-18

Family

ID=21947808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88907914A Expired - Lifetime EP0375727B1 (en) 1987-05-07 1988-06-22 Improved aerosol container closure

Country Status (11)

Country Link
EP (1) EP0375727B1 (en)
KR (1) KR970005138B1 (en)
AR (1) AR240158A1 (en)
AT (1) ATE97377T1 (en)
CA (1) CA1315217C (en)
ES (1) ES2008468A6 (en)
GB (1) GB2206650B (en)
NZ (1) NZ224538A (en)
PT (1) PT87439B (en)
WO (1) WO1989012583A1 (en)
ZA (1) ZA883263B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1315217C (en) * 1987-05-07 1993-03-30 Robert Henry Abplanalp Aerosol container closure
ZA929464B (en) * 1991-12-26 1993-06-10 Precision Valve Corp Gasket for an aerosol mounting cup.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206650A (en) * 1987-05-07 1989-01-11 Precision Valve Corp Aerosol container closure

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Publication number Priority date Publication date Assignee Title
US3417177A (en) * 1966-03-09 1968-12-17 Grace W R & Co Method of making gasketed closures
US3825148A (en) * 1972-09-25 1974-07-23 Gen Electric Hermetic sealing system for plastic tank and cover
US3910448A (en) * 1974-05-31 1975-10-07 Raychem Sa Nv Heat recoverable closure assembly
EP0007487B1 (en) * 1978-07-10 1981-11-11 Del Bon, Franco Sealed can and preformed closure element therefor, as well as method and apparatuses for manufacturing them
GB2046127B (en) * 1979-03-20 1983-05-25 Raychem Ltd Seals
US4281763A (en) * 1979-10-31 1981-08-04 Pace Joseph A Two-piece hardshell, soluble and digestible liquid containing gelatin capsule
DE3267450D1 (en) * 1981-08-26 1985-12-19 Raychem Ltd Heat recoverable article
JPS5857480A (en) * 1981-09-30 1983-04-05 Toyo Seikan Kaisha Ltd Production of metallic bottle
US4401231A (en) * 1982-05-28 1983-08-30 Container Corporation Of America Container closure sealing member and method of forming
CA1207717A (en) * 1982-07-06 1986-07-15 Joseph L. Roe Valve mounting assembly for aerosol containers and the like
JPS5980481A (en) * 1982-10-29 1984-05-09 Fuji Photo Film Co Ltd Location and fixation
US4560566A (en) * 1984-01-04 1985-12-24 Continental Packaging Company, Inc. Method of hot filling and closing a container
US4697719A (en) * 1986-11-03 1987-10-06 Allen Tool Company, Inc. Foil-lid combination for containers

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
GB2206650A (en) * 1987-05-07 1989-01-11 Precision Valve Corp Aerosol container closure

Also Published As

Publication number Publication date
EP0375727A1 (en) 1990-07-04
KR970005138B1 (en) 1997-04-12
KR900006202A (en) 1990-05-07
PT87439A (en) 1989-05-31
CA1315217C (en) 1993-03-30
NZ224538A (en) 1990-09-26
PT87439B (en) 1994-04-29
GB2206650A (en) 1989-01-11
ZA883263B (en) 1988-11-09
GB2206650B (en) 1991-03-06
AR240158A1 (en) 1990-02-28
EP0375727B1 (en) 1993-11-18
GB8810700D0 (en) 1988-06-08
ES2008468A6 (en) 1989-07-16
WO1989012583A1 (en) 1989-12-28
ATE97377T1 (en) 1993-12-15

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