WO2014146977A1 - Procédé et dispositif de fabrication de boîtes ainsi que corps de boîte - Google Patents

Procédé et dispositif de fabrication de boîtes ainsi que corps de boîte Download PDF

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Publication number
WO2014146977A1
WO2014146977A1 PCT/EP2014/055064 EP2014055064W WO2014146977A1 WO 2014146977 A1 WO2014146977 A1 WO 2014146977A1 EP 2014055064 W EP2014055064 W EP 2014055064W WO 2014146977 A1 WO2014146977 A1 WO 2014146977A1
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WO
WIPO (PCT)
Prior art keywords
stretch
hollow body
stability element
blown hollow
region
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.)
Ceased
Application number
PCT/EP2014/055064
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German (de)
English (en)
Inventor
Werner Boltshauser
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COSMOBRAIN AG
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COSMOBRAIN AG
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Filing date
Publication date
Application filed by COSMOBRAIN AG filed Critical COSMOBRAIN AG
Publication of WO2014146977A1 publication Critical patent/WO2014146977A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/24—Lining or labelling
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2017—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements outside the article
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2021—Inserts characterised by the material or type
    • B29C2049/2047—Tubular inserts, e.g. tubes
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/24—Lining or labelling
    • B29C2049/2412—Lining or labelling outside the article
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/24—Lining or labelling
    • B29C2049/2414—Linings or labels, e.g. specific geometry, multi-layered or material
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/24—Lining or labelling
    • B29C2049/2414—Linings or labels, e.g. specific geometry, multi-layered or material
    • B29C2049/2422—Cylindrical or sleeve shaped linings or labels
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/24—Lining or labelling
    • B29C2049/2414—Linings or labels, e.g. specific geometry, multi-layered or material
    • B29C2049/24302—Label materials
    • B29C2049/24306—Label materials using different material for the label and the preform
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7142—Aerosol containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles

Definitions

  • the invention relates to a method for producing can bodies according to the preamble of claim 1, on can body according to the preamble of claim 13 and to devices for producing can bodies according to the preamble of claim 15.
  • Can bodies are formed one or more parts.
  • a cylindrical can body is provided by cold extrusion. Subsequently, a narrowed neck part is formed at the open end by upset necking.
  • This manufacturing process is very complex due to the required for the many processing steps and the water and energy requirements for cleaning and drying.
  • US Pat. No. 4,095,544 and EP 0 666 124 A1 describe the production of seam-free steel cans.
  • the cylindrical can body is produced by punching, pressing and ironing out of a sheet metal coated with tin or plastic.
  • When forming a narrowed can neck enormous problems can occur because the material structure is changed by the stretching or hardened.
  • the known one-piece cans are located on the outside cans fat or oil residues. To form a decorative layer, cleaning (washing, drying), priming (drying), printing and overcoating are performed directly on the vessel outer surface, which is very expensive.
  • a solution is known in which, starting from a metal strip with a forming and a welding step, a circumferentially closed tube is made, are separated from the jacket sections for cans. At each closed with a pushed laser longitudinal seam can jacket is attached to the lower end side of a can bottom with a laser seam. At the upper end a constriction is formed. Optionally, the upper end of the can jacket is necked by upset necking or spin-flow necking, which restriction can be made to form a valve seat.
  • can jackets are produced from flat material regions which are closed in the circumferential direction with an adhesive bond in an overlapping region for producing a can body with a can jacket extending in the circumferential direction about a can axis and a can bottom. On one end of each can jacket a can bottom is attached.
  • the cost of a tight connection between the can jacket and bottom of the can can be undesirably large.
  • Stretch blown aerosol cans made of PET must be produced with wall thicknesses or thick- nesses in a high range of 2-3 mm in order to reduce the risk of breakage due to signs of embrittlement.
  • the necessary large wall thicknesses of the preforms lead to production problems.
  • DE 100 31 136 A1 discloses an aerosol or compressed gas can body made of polyethylene terephthalate (PETP) and / or polyethylene naphthalate (PEN), which is intended to overcome the disadvantages of aerosol cans made of PET.
  • the wall thickness can only be reduced due to the choice of material matched to the product. This solution is therefore neither generally applicable nor simple and safe.
  • the risk of breakage is determined by the areas with minimal wall thicknesses. In areas with higher wall thicknesses material is used ineffective.
  • the price shows that the production of the plastic cans involves much more effort.
  • GB 2 214891 A shows aerosol cans made of plastic, in which a stretch blown inner container is inserted into at least one outer vessel part made of plastic.
  • the stretch-blown inner container In order to enable automated insertion, the stretch-blown inner container must have a sufficient have inherent stability or dimensional stability.
  • the outer vessel part comprises at least one sleeve-shaped portion and is made as a shatter-proof injection molded part of loadable plastic, which is associated with a great effort and high material costs.
  • the sum of the wall thicknesses of the adjacent wall regions of the inner container and of the outer container part are relatively large, so that the amount of plastic material necessary for the entire aerosol can is very large.
  • the insertion of the inner container in the at least one outer Gefästeil is complex and can lead to damage. The production effort becomes even greater if the external shape of the aerosol can deviates from the cylindrical shape. Then at least two outer vessel parts are pushed together over the inner container.
  • the present invention has for its object to find a solution with the cans can be easily and inexpensively manufactured, wherein in addition to the tightness of the can and their appearance should be high quality.
  • the production should preferably take place with the greatest possible flexibility and with simple systems.
  • the can bodies include a can jacket extending about a can axis which extends along the can axis over a can height from a can bottom to a final valve region. At least in a section of the can height that extends from the bottom of the can, the can jacket has a stability element which encloses a stretch-blown hollow body.
  • the stretch blown step performed on a preform to form the stretch blown hollow body is performed in the stability element.
  • the stretch blow-molding step is performed such that after the stretch blow-molding step, a portion of the outside of the stretch blown hollow body abuts against a portion of the inside of the sleeve-shaped portion of the stability element.
  • the stretch blow-molding step is carried out in a blow mold in which the stability element is inserted before the stretch blow-molding step.
  • an inherent stability or dimensional stability of the stretch-blown hollow body can be dispensed with in the region of the stability element.
  • the stretch blow molding directly inside the stability element, the hollow body receives the dimensional stability by the contact with the stability element. In this area, the variation of the wall thickness is small, so that the stretch blown hollow body comprises substantially no material that is not needed.
  • the stability element is designed to ensure the necessary stability. Its sleeve-shaped portion can be formed with a substantially constant wall thickness.
  • the stability element preferably comprises a closure bottom, which forms the nozzle bottom.
  • the stretch blown hollow body only has to provide a dense layer so that the interior of the can body is connected to the environment only at the final valve area.
  • the final valve area is formed on the stretch-blown hollow body and is closed when a can is finished with a valve, with a cover fastened via a folding connection or with a rotary closure.
  • the stability of the can body is ensured in the region of the stability element of this. If the stretch-blown hollow body projects beyond the stability element in the final valve area, the projecting end area is formed with a sufficiently high stability or an increased wall thickness, so that the entire can body has the necessary stability.
  • the preform is pre-tempered for the stretch blow-molding step, wherein the pre-tempering is preferably carried out before the introduction of the preform into the blow mold. Due to the previous tempering, the processing time in the blow mold can be reduced.
  • the preferred preforms are formed so that the stretch blown hollow bodies provide a can throat at the valve area. If an engagement form for an aerosol can lid is formed on the neck portion, it may be formed so precisely that it cooperates securely with the corresponding engagement shape of the lid. By choosing plastics with similar material properties for the preform and the lid, the security of interaction can be increased even at different temperatures.
  • the stretch-blown hollow body projects beyond the stability element at the valve region, where a wall thickness is formed which is at least four times, preferably at least eight times, as large as the wall thickness in a central axis section of the stability element.
  • More preferred aerosol can preforms are designed to provide a valve seat of precise shape at the valve area. This valve seat is not changed during stretch blow molding, so that even on the finished can body a precisely shaped valve seat is formed, which can be optimally associated with the corresponding connection point of a valve in connection.
  • the common valves or valve plates can be tightly secured by crimping. But it is also possible that new valves, especially those with a connection area made of plastic, are tightly connected to the valve seat. In addition, latching, screwed, glued or even formed with supplied heat connections in question. By choosing plastics with similar material properties for the preform and the connection area of the valve, a tight connection can be ensured even at different temperatures.
  • the stability element with the sleeve-shaped section comprises a closure bottom which forms the bottom of the can.
  • the stability element with closure bottom is formed as desired in the area near the ground of the aerosol cans.
  • the stretch blown step is performed so that after the stretch blown step, a portion of the outside of the stretch blown hollow body abuts against an area of the inside of the end floor. As a result, essentially the entire area of the hollow body within the stability element is in contact with the stability element.
  • the built-up after filling the aerosol can internal pressure can be taken up accordingly by the stability element.
  • a particularly complete concern of the stretch blown hollow body on the inside of the stability element is achieved in that the stability element in the transition region from the sleeve-shaped portion to the bottom end passage openings are formed through which air can escape during stretch blowing.
  • the stability element is formed of metal.
  • Metal has the advantage over plastic that even with small wall a great stability is achieved and that this stability remains over a wide temperature range.
  • all known from the prior art can manufacturing can be used for can coats and / or can coats with arranged thereon cans. Because the stability of the element from the sleeve-shaped section to the final bottom not tight but only must be stable, the manufacturing cost of the stability element can be made smaller than for conventional aerosol cans fixed to the wall of the can wall. Due to minimal material quantities and efficient manufacturing processes, stability elements can be produced very efficiently and optimized for their function.
  • a decorative layer is formed on the outside of the sleeve-shaped portion of the stability element before insertion into the blow mold, then the elaborate printing of can bodies can be dispensed with. This is particularly advantageous when the decorative layer is applied to flat material, which is then converted to the sleeve-shaped portion of the stability element, preferably on the sleeve-shaped portion, a closure bottom is attached.
  • the production of sleeve and / or cup-shaped stability elements, in particular with decor attached to the sleeve outer surface, is particularly efficient with metallic material, preferably flat material or sheet metal.
  • a cross-sectional constriction is formed on the sleeve-shaped section of the stability element in the direction of the can axis from the bottom of the can toward the terminating valve area, at least in a partial region, preferably in the end region facing the terminating valve region.
  • stability elements made of metal starting from a cylindrical element with a deformation of the shell or the sleeve-shaped section, the desired shape can be easily formed.
  • the sleeve-shaped portion is pressed directly during stretch blow molding to the blow mold and thereby slightly reshaped.
  • the blow mold is formed at least in two parts, so that the parts of the blow mold from the pressed sleeve-shaped portion of the stability element and can be moved away from each other to deliver the can body produced.
  • the parts of the blow mold are brought together again for the next forming step or stretching blow step.
  • a high pressure for example 50 bar
  • a liquid preferably water
  • a liquid is introduced into the hollow body to achieve the high Umformungsdru-, wherein a liquid is particularly suitable for difficult forming steps due to their incompressibility.
  • liquid is already filled into the preform, so that the stretch blow-molding step is also carried out with liquid.
  • the stability element introduced water must be discharged from the can body again.
  • the contents of the can for stretch blow molding or forming the stability element is used directly, so that this no longer or only a small part of it must be discharged from the finished box.
  • decorative surface designs or embossings can also be provided.
  • the stretch blown step is performed inside the stability member, the abutment of the stretch blown hollow body to a sleeve-shaped portion having strong molding properties can be ensured.
  • the stretch-blown hollow body is retained on the stability element at least after the formation of an overpressure inside the can. If this adhesion between the hollow body and the stability element does not suffice for safe keeping together, adhesive may also be applied to a region of the inner side of the stability element before the stretch blow molding.
  • the stretch-molded hollow body is to be separated again from the stability element after emptying the can, it is expedient if the adhesion between these two parts is so small in the absence of overpressure in the can interior that the stretch-blown hollow body can be pulled out of the stability element.
  • the different materials of these parts can be disposed of separately, which is particularly advantageous if the stability element is formed of metal.
  • the stretch-blown hollow body is designed so that it has a threaded opening for a rotary closure at the end region wherein the threaded opening is formed already in the manufacture of the preform and the stretch blown hollow body comprises a narrowed neck portion.
  • This box has the features of a beverage can with screw cap.
  • an edge region is formed at the end region on the stretch blown hollow body, to which a lid is to be fastened via a folding connection.
  • the lid comprises a push-on opening and the can thus has the characteristics of the widespread beverage cans.
  • the stretch blown hollow body is formed so that its lower bottom portion forms the can bottom, wherein starting from a lower end portion of the sleeve-shaped stability element at the lower bottom portion a wall thickness is formed which at least four times, preferably at least eight times, so is large as the wall thickness of the stretch blown hollow body in a central axis portion of the stability element.
  • the stretch-blown hollow body forms the bottom of the can and / or a neck piece protruding beyond the stability element, then it is advantageous if the sleeve-shaped stability element has at least one first cross-sectional constriction at the corresponding end and an internal cross-sectional constriction associated therewith. Between these two cross-sectional constrictions, the stability element projects somewhat radially outward. A solid part of the stretch-blown hollow body lies in a form-fitting manner against this annularly outwardly projecting region, so that mechanical forces can be transferred from the stretch-blown hollow body to the stability element.
  • Stretch blow molding involves injection blow molding, which combines the precision of injection molding with the design possibilities of blow molding.
  • the stretch blown hollow body receives a closure area with access opening in injection molding quality. No post-processing of the closing area is required.
  • the end portion may be formed in the shape of a valve seat, a screw cap, or another terminal portion for a lid.
  • Other advantages include the maintenance of uniform wall thicknesses, waste-free production, seamless seams in the neck and bottom area, high surface quality, high quality Strength due to the additional biaxial extension with retracting mandrel. Because it can be dispensed with seams, a high compressive strength is guaranteed.
  • Stretch blow molding systems are simple. They consist of a plasticizing unit or a tempering station and the blowing station. The preform is passed through in advance
  • Injection molding produced. He needs much less space than the stretch blown hollow body or the can body. If the preforming is made spatially separate from the stretch blow molding, then the necessary transport is not associated with large void volume Stretching bubbles takes place for transport reasons, preferably in the immediate vicinity of the bottler instead. In an embodiment with low transport costs, the preform and the can body are produced directly at the bottler.
  • the plastic used is preferably (PET).
  • PET IR radiant heaters are used, which ensure a specific heating profile by the separate adjustability of the radiator tubes along the axis of the preform.
  • the terminal area with the access opening is protected by cooling devices from undesired heating.
  • the preform is stretched with a mandrel in the direction of its longitudinal axis and then carried out the pressure or blow molding.
  • cooling the blow mold ensures rapid cooling of the stretch blown hollow body.
  • the blow mold is opened and removed the can body.
  • the stretch blown hollow body can optionally also be produced by means of extrusion blow molding. It does not need a preform produced by injection molding, but it is continuously or discontinuously ejected a tube of hot moldable plastic from a flanged tool as a preform vertically downwards (extruded).
  • the thickness of the material in the hose is continuously regulated according to the shape and the desired wall thickness of the hollow body. With a spike can be retracted into the hose.
  • the preform is completed by squeezing. From below, the sleeve-shaped section of the stability element is pushed over the preform formed from the tube.
  • the two-part blow mold which is still open when the stability element is introduced, then travels to and surrounds the sleeve-shaped section of the stability element with the hose and the mandrel arranged therein.
  • the terminal area with access opening is formed between the mandrel and the blow mold and separated from the subsequent tube. Air is then forced through the mandrel into the hose, whereby it is inflated and pressed against a region of the inside of the sleeve-shaped section of the stability element and against the contour of the blow mold and cooled.
  • slugs are made of plastic which are partially sheared off from the blow mold and / or can be removed with a post-processing.
  • 3 and 4 are schematic longitudinal sections through a stretch blow mold with elements of an aerosol can
  • 5 to 8 are schematic longitudinal sections through an aerosol can
  • Fig. 12 side view of an aerosol can with stretch blown hollow body in the stability element
  • Fig. 1 3 to 15 are schematic longitudinal sections through beverage cans, where left and right two different versions are shown.
  • 1 shows the sleeve-shaped section 2 of a stability element 1.
  • a closure bottom 3 is arranged on the sleeve-shaped section 2 and subsequently fastened.
  • the resulting cup-shaped stability element 1 can be made according to any known from the prior art can manufacturing process manufacturing method for can coats with arranged thereon can floors.
  • the connection from the sleeve-shaped section 2 to the closure bottom 3 does not have to be tight, but instead just be stable.
  • a connection with welding points can be provided.
  • openings may also be formed at the connection area.
  • Fig. 3 shows a blow mold 4 with an inner mold 5 in the interior of the stability element 1 is inserted. It goes without saying that the outer shape of the stability element is substantially adapted to the inner mold 5. In addition, a heated preform 6 is introduced into the blow mold 4 and into the stability element 1. In Fig. 4, the end of the Streckblas suitss is shown. In this case, the stability element 1 bears against the inner surface 5 of the blow mold 4. The outside of the stretch blown hollow body 7 abuts against the inside of the stability element 1.
  • the preform 6 is designed so that it forms a valve region 9 with a valve seat 8 at the open end.
  • This valve seat 8 is not changed during stretch blow molding, so that even on the finished can body 10, a precisely shaped valve seat 8 is formed.
  • the sleeve-shaped portion 2 of the stability element 1 does not extend from the closure bottom 3 to the valve region 9.
  • the stretch blown hollow body 7 extends as a narrowed neck portion 11 to the valve seat 8.
  • the neck portion 1 1 has the stretch blown Hollow body 7 a much larger wall thickness than in the area with the stability element 1.
  • the sleeve-shaped portion 2 of the stability element 1 is also slightly narrowed towards the neck portion 11.
  • FIG. 5 shows the can body 10 with the can bottom formed by the closure bottom 3, the can jacket 12 formed by the stability element 1 and the stretch blown hollow body 7, as well as with the valve region 9.
  • a product 13 is filled inside this aerosol can body.
  • Fig. 6 shows the can body 10 after insertion of the valve 14.
  • the bubbles 15 indicate that even the pressurized gas has been introduced through the valve.
  • an unillustrated can lid is placed. If an engagement form 6 for the can lid is formed on the neck part 1 1, then this can be done so precisely be formed so that it cooperates securely with the corresponding form of engagement of the lid.
  • Figures 7 and 8 show a similar aerosol can body as Figures 5 and 6, wherein the shape is approximated to a known aerosol can of the prior art.
  • the sleeve-shaped stability element 1 comprises at the bottom of the can only a lower cross-sectional constriction 1 a and no end floor.
  • the bottom of the can is formed by a lower bottom portion 7 a of the stretch blown hollow body 7.
  • a wall thickness is formed that is at least four times, preferably at least eight times, as large as the wall thickness of the stretch blown hollow body 7
  • an adhesive connection and / or a form-locking connection is formed between these two elements.
  • a positive connection can be achieved via mutually adapted groove and spring arrangements of the two elements.
  • a narrowed neck part 11 with the valve seat 8 is formed on the stretch blown hollow body 7.
  • This neck portion 11 protrudes beyond the stability element 1 and is formed with a wall thickness which is at least four times, preferably at least eight times, as large as the wall thickness of the stretch blown hollow body 7 in a middle axis portion of the stability element 1.
  • the sleeve-shaped stability element 1 comprises at the upper end an upper cross-sectional constriction 1 b and preferably including an inner cross-sectional constriction 1 c. Between the upper and the inner cross-sectional constriction 1 b and 1 c, the stability element 1 projects slightly outward in a ring shape. At this annular outwardly projecting portion of the neck portion 1 1 is so on, so that mechanical forces are transmitted from the neck portion 1 1 to the stability element 1.
  • the desired shape can be easily formed.
  • the sleeve-shaped portion is pressed directly during stretch blow molding to the blow mold and thereby slightly reshaped.
  • a high pressure for example, 50 bar, constructed so that the stability element is at least partially deformed at the blow mold radially outward.
  • a valve plate 14a with the valve 14 is firmly crimped on the valve seat 8.
  • 9 and 10 show two different preforms 6, which each have a radially outwardly standing retaining flange 6a.
  • 9 shows a preform 6 with a valve seat 8 for an aerosol can and in FIG. 10 a preform for a can with a threaded opening for a screw cap.
  • the wall thickness of the stretch blown hollow body 7 in a contact area 7b which is located within the sleeve-shaped portion 2 of the stability element 1, a substantially smaller wall thickness than in the areas not to the
  • the wall thickness of the stretch blown hollow body 7 in the abutment region 7b is less than 0.4 mm, preferably less than 0.2 mm, in particular less than 0.1 mm. It is possible to choose a wall thickness that is smaller than the wall thicknesses common in PET bottles.
  • the preform 6 is designed accordingly and preheated accordingly for the stretch blow molding.
  • the preform 6 corresponding areas.
  • the heating of the preform 6 is carried out in such a way that the areas which are to become very thin are heated more than the area which is intended to maintain a higher wall thickness.
  • stretch blow molding the preform is first stretched in its length with a drawing element pushed into the preform 6. During this expansion, the wall thickness is reduced in the later resting area 7b.
  • the wall of the preform 6 with the abutment portion 7b radially to the sleeve-shaped portion 2 of the stability element 1 is extended.
  • the lower bottom region 7a and the narrowed neck part 11 are converted by the expansion of the preform 6 into the shape of the blow mold. shaped.
  • the wall thicknesses at the lower bottom portion 7a and the narrowed neck portion 1 1 are only slightly reduced.
  • FIG. 12 shows a can body 10 in the form of an aerosol can, in which the stability element 1 is visible in the side view in the middle and lower regions, and the stretch-blown hollow body 7 can be seen at the upper end.
  • FIGS. 13 to 15 schematically show production steps of a beverage can according to the invention.
  • an embodiment is shown in each case in which the stretch-blown hollow body 7 or the preform 6 protrudes slightly above the stability element 1.
  • the stretch-blown hollow body 7 ends at the same height as the stability element 1.
  • the preform 6 used in stretch blow molding comprises at the upper end region with the access opening an exactly shaped edge region 19 which projects slightly outwards, so that it is suitable for holding the preform 6.
  • the edge region 19 is placed on a correspondingly shaped edge region of the stability element 1.
  • the edge region 19 protrudes slightly above the stability element 1.
  • the edge region 19 is held between a holding region of the blow mold adapted to the edge region 19 and the mandrel introduced for blowing.
  • the preform 6 is previously heated so that it has a very small wall thickness in the tubular portion of the stability element after the stretch blow molding and in the bottom region substantially greater wall thickness.
  • the sleeve-shaped stability element 1 has the bottom of the can only a lower
  • the bottom of the can is formed by a lower bottom portion 7 a of the stretch blown hollow body 7. So that the bottom region 7a ensures the required stability, starting from a lower end region of the sleeve-shaped stability element 1 at the lower bottom region 7a, a greater wall thickness is formed than in the upper region. It goes without saying that, instead of the bottom region 7a with greater wall thickness, it is also possible to use a stability element 1 with a discharge bottom and a thin bottom region 7a.
  • FIG. 14 shows an intermediate step in forming the folded or double seam connection 18, wherein a portion of the upper edge region 19 is deformed outwards horizontally and is received in a corresponding groove of the cover 17.
  • the seam connection 18 is produced.
  • the upper edge region 19 is heated for at least one of its deformations.
  • the lid 17 is attached only to the stretch blown hollow body 7. This is particularly advantageous when the wall material of the stability element 1 can not be formed with sufficient accuracy due to a small wall thickness for the rabbet joint.
  • the cover 17 is fastened to the stretch-blown hollow body 7 and to the stability element 1.
  • the lid 17 is attached only after filling the can.
  • an adhesive or sealing compound is provided instead of the seam connection 18.
  • the stretch-blown hollow body 7 forms an inner coating of the can body 10, which is tightly connected to an inner coating of the lid 1 7. If the mechanical connection between the can body 10 and cover 17, as shown on the left side of Fig. 13 to 15, is formed only over the upper edge 19 of the stretch blown hollow body 7, so its upper edge 19 must ensure the desired mechanical stability. If the stability element 1 also extends into the seam connection 18, as shown on the right-hand side of FIGS. 13 to 15, the stretch-blown hollow body 7 can also have a small wall thickness at the upper edge 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

Pour fabriquer des corps de boîte (10) comprenant une enveloppe (12) qui court autour d'un axe de boîte et s'étend le long de l'axe de boîte sur une hauteur allant d'un fond (3) de boîte à une zone de soupape (9), une préforme (6) est formée en un corps creux (7) soufflé-étiré par une étape de soufflage-étirage dans l'élément de stabilité (1) en forme de douille. L'étape de soufflage-étirage est effectuée de manière qu'après celle-ci, une région du côté extérieur du corps creux (7) soufflé-étiré repose contre une région du côté intérieur de l'élément de stabilité (1) en forme de douille. Dans la région de l'élément de stabilité (1), on peut renoncer à une stabilité propre ou une stabilité de forme du corps creux (7) soufflé-étiré. Par le soufflage-étirage directement à l'intérieur de l'élément de stabilité (1), le corps creux (7) acquiert la stabilité de forme du fait qu'il repose contre l'élément de stabilité (1).
PCT/EP2014/055064 2013-03-22 2014-03-14 Procédé et dispositif de fabrication de boîtes ainsi que corps de boîte Ceased WO2014146977A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00649/13 2013-03-22
CH00649/13A CH707820A2 (de) 2013-03-22 2013-03-22 Verfahren und Vorrichtung zum Herstellen von Aerosoldosen sowie Dosenkörper.

Publications (1)

Publication Number Publication Date
WO2014146977A1 true WO2014146977A1 (fr) 2014-09-25

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CH (1) CH707820A2 (fr)
WO (1) WO2014146977A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016060632A1 (fr) * 2014-10-17 2016-04-21 Emi̇rcan Necat Procédé de production d'une bonbonne d'eau jetable avec enveloppe
CN112247005A (zh) * 2020-08-19 2021-01-22 杭州中粮包装有限公司 一种葫芦状单片气雾罐及其生产工艺、应用

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2214891A (en) * 1988-02-05 1989-09-13 Fibrenyle Ltd Containers for pressurized material
EP0391817A1 (fr) * 1989-04-05 1990-10-10 Cebal S.A. Distributeur à poche
FR2785845A1 (fr) * 1998-11-17 2000-05-19 Inoac Packaging Group Inc Conteneur composite ayant une base stabilisee
DE102007014870A1 (de) * 2007-03-26 2008-10-02 Khs Ag Verfahren zum Herstellen von Flaschen oder dergleichen Behälter aus Kunststoff
WO2009015498A1 (fr) * 2007-07-27 2009-02-05 Crebocan Ag Corps de boîtier et procédé et dispositif pour sa fabrication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2214891A (en) * 1988-02-05 1989-09-13 Fibrenyle Ltd Containers for pressurized material
EP0391817A1 (fr) * 1989-04-05 1990-10-10 Cebal S.A. Distributeur à poche
FR2785845A1 (fr) * 1998-11-17 2000-05-19 Inoac Packaging Group Inc Conteneur composite ayant une base stabilisee
DE102007014870A1 (de) * 2007-03-26 2008-10-02 Khs Ag Verfahren zum Herstellen von Flaschen oder dergleichen Behälter aus Kunststoff
WO2009015498A1 (fr) * 2007-07-27 2009-02-05 Crebocan Ag Corps de boîtier et procédé et dispositif pour sa fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016060632A1 (fr) * 2014-10-17 2016-04-21 Emi̇rcan Necat Procédé de production d'une bonbonne d'eau jetable avec enveloppe
CN112247005A (zh) * 2020-08-19 2021-01-22 杭州中粮包装有限公司 一种葫芦状单片气雾罐及其生产工艺、应用

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