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WO1990010531A1 - Procede de creation de structures internes dans des produits moules par soufflage - Google Patents

Procede de creation de structures internes dans des produits moules par soufflage Download PDF

Info

Publication number
WO1990010531A1
WO1990010531A1 PCT/CA1990/000087 CA9000087W WO9010531A1 WO 1990010531 A1 WO1990010531 A1 WO 1990010531A1 CA 9000087 W CA9000087 W CA 9000087W WO 9010531 A1 WO9010531 A1 WO 9010531A1
Authority
WO
WIPO (PCT)
Prior art keywords
parison
mould
frame
tube
improvement
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/CA1990/000087
Other languages
English (en)
Inventor
Hans Schwochert
Wolfgang Weber
Andy Puempel
Hans Kogel
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.)
KAUTEX OF CANADA Inc
Original Assignee
KAUTEX OF CANADA Inc
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
Priority claimed from GB8901591A external-priority patent/GB2218361B/en
Application filed by KAUTEX OF CANADA Inc filed Critical KAUTEX OF CANADA Inc
Publication of WO1990010531A1 publication Critical patent/WO1990010531A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • 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
    • B29C49/04—Extrusion blow-moulding
    • B29C49/0411—Means for defining the wall or layer thickness
    • B29C49/04114—Means for defining the wall or layer thickness for keeping constant thickness
    • 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
    • B29C2049/2034—Attachments, e.g. hooks to hold or hang the blown article
    • B29C2049/2039—Handles, e.g. handles or grips on bottles
    • 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
    • B29C49/04—Extrusion blow-moulding
    • B29C49/041—Extrusion blow-moulding using an accumulator head

Definitions

  • This invention relates in general to extrusion blow processing, and more particularly to a process for creating internal structures within blow extruded products.
  • plastic vehicle fuel tanks often require a fuel reservoir in the form of a circular ridge projecting from the inside wall of the tank for accommodating a fuel pump.
  • baffle walls are sometimes required to ' prevent excess sloshing of fuel within the fuel tank.
  • Prior art techniques for creating such internal structures involve creating a plastic mould with such structures embossed on the surface.
  • the tube is expanded against the mould such that the required structure (i.e. reservoir walls, baffle walls, etc.) is formed.
  • a process is provided for creating internal structures within blow extruded products while maintaining the outer surface flush, thereby overcoming the prior art disadvantages of poor flame test performance and excess wasted volume.
  • a method for creating a blow moulded product comprising the steps of extruding a parison tube (13) into a cavity formed between opposite halves of a mould (15) , pinching off a topmost portion of said parison via crimping apparatus (17 and 19), admitting high pressure compressed gas into the inner portion of said parison tube via a blow pin (14) for inflating the tube against said opposite halves of said mould thereby creating said blow moulded product, the improvement comprising the step of securing a frame" (1) to an inside wall of at least one of said opposite halves of said mould, said frame being provided with one or more apertures through which said parison tube passes responsive to inflating of said parison tube, such that said parison forms around and encapsulates said frame to form an internal structure of said blow moulded product.
  • Figure 1 is a perspective view of a frame for implementing the process of the present invention
  • Figure 2 is a cross-sectional view of a blow moulding machine and the frame of Figure 1 implementing the process of the present invention
  • Figure 3 is an enlarged cross-sectional view of the frame within the machine of Figure 2 during moulding.
  • Figures 4 and 5 are perspective views of injected moulded parts substituting for the frame in accordance with alternative embodiments of the invention. Best Mode For Carrying Out the Invention
  • a frame 1 comprising a pair of parallel loops 3 and 5 and a plurality of connecting foot members 7 extending between the loops 3 and 5.
  • the frame 1 is shown inserted into the mould 15 of a blow extrusion moulding machine by means of securing the foot members 7 into the wall of the mould 15, although other means for securing the frame 1 thereto may be provided.
  • a parison 13 is extruded from the accumulator head 11 of the apparatus into the cavity formed by both halves of the mould 15.
  • the parison 13 is pinched off at top and bottom portions via crimping apparatus 17 and 19.
  • High pressure compressed gas is admitted into the inner portion of tube 13 via blow" pin or needle 14 for inflating the tube 13 against the walls of mould 15 and consequently also against the wire frame 1.
  • the plastic 13 bends or forms around the frame 1 thereby completely encapsulating the frame 1 within the parison 13. Finally, the mould 15 is opened and the final plastic product is removed. Any excess material (i.e. flash) 7 is then snapped or cut off leaving a smooth outer surface.
  • internal structures such as walls, reservoirs, etc. may be created without the requirement of specially machined mould walls.
  • the final product includes all necessary structures internally thereof yet exhibits a smooth outer surface, resulting in substantial increase in container volume.
  • superior performance is achieved in flame safety testing over prior art techniques, due to uniform wall thickness.
  • Figure 4 shows a plastic injection molded part
  • the base portion 26 may be removably secured to the inside wall of mould 15 using one of a number of well known techniques (e.g. provision of a vacuum at the surface of the wall to thereby retain the base portion 26) .
  • Figure 5 shows a further plastic injection molded part 25 having a U-shaped portion 28 defining an aperture 27 around which the blow extruded plastic effectively bends or forms for completely encapsulating the part 25 within the parison tube 13, for creating an internal baffle structure.
  • the U-shaped portion 28 projects from a generally rectangular base 30 which may be removably secured to the inside wall of the mould 15.
  • the internal structure forming parts illustrated in Figures 1, 4, and 5 are representative of the varieties of designs contemplated. However, numerous other such designs are possible for creating internal structures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

Dans un procédé de création d'un produit moulé par soufflage comprenant les étapes d'extrusion d'un tube de paraison (3) dans une cavité formée entre des moitiés opposées d'un moule (15), de pincement des parties extrêmes de la paraison à l'aide d'un appareil de sertissage (17 et 19), d'admission d'un gaz comprimé à haute pression dans la partie interne du tube de paraison à l'aide d'une pointe de soufflage de gaz (14) pour gonfler le tube contre les moitiés opposées du moule, créant ainsi le produit moulé par soufflage, l'amélioration consiste à fixer un cadre (1) sur la paroi intérieure d'au moins l'une des moitiés opposées du moule, le cadre étant pourvu d'une ou de plusieurs ouvertures au travers desquelles la paraison peut passer après soufflage du tube, de sorte que la paraison se forme autour du cadre, lequel est encapsulé par celle-ci pour former une structure interne du produit moulé par soufflage.
PCT/CA1990/000087 1989-01-25 1990-03-15 Procede de creation de structures internes dans des produits moules par soufflage Ceased WO1990010531A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8901591A GB2218361B (en) 1988-05-14 1989-01-25 Method of producing grinding tool and apparatus for producing same
GB89015918.2 1989-03-15

Publications (1)

Publication Number Publication Date
WO1990010531A1 true WO1990010531A1 (fr) 1990-09-20

Family

ID=10650564

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1990/000087 Ceased WO1990010531A1 (fr) 1989-01-25 1990-03-15 Procede de creation de structures internes dans des produits moules par soufflage

Country Status (1)

Country Link
WO (1) WO1990010531A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1479392A1 (de) * 1960-10-22 1970-03-05 Lippert Ehrenfried Verfahren zum Herstellen von Behaeltern mit Einsaetzen
US4133860A (en) * 1974-01-14 1979-01-09 United States Steel Corporation Method of moulding a reinforced thermoplastic article
EP0008964A1 (fr) * 1978-07-28 1980-03-19 Société de Transformation des Matières Plastiques Procédé d'obtention d'un corps creux monobloc par soufflage et corps creux obtenu
GB2051661A (en) * 1979-06-15 1981-01-21 Kautex Maschinenbau Gmbh Hollow bodies having inserts
US4248466A (en) * 1978-11-13 1981-02-03 Carper William B Snow scoop with wear strip along lip and method of attaching the wear strip in a blow molding process
US4608744A (en) * 1984-09-04 1986-09-02 Tachikawa Spring Co., Ltd. Frame molding process of a seat for vehicles
JPH0618326A (ja) * 1992-06-30 1994-01-25 Stanley Electric Co Ltd 生体高分子複合体を用いた光電変換装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1479392A1 (de) * 1960-10-22 1970-03-05 Lippert Ehrenfried Verfahren zum Herstellen von Behaeltern mit Einsaetzen
US4133860A (en) * 1974-01-14 1979-01-09 United States Steel Corporation Method of moulding a reinforced thermoplastic article
EP0008964A1 (fr) * 1978-07-28 1980-03-19 Société de Transformation des Matières Plastiques Procédé d'obtention d'un corps creux monobloc par soufflage et corps creux obtenu
US4248466A (en) * 1978-11-13 1981-02-03 Carper William B Snow scoop with wear strip along lip and method of attaching the wear strip in a blow molding process
GB2051661A (en) * 1979-06-15 1981-01-21 Kautex Maschinenbau Gmbh Hollow bodies having inserts
US4608744A (en) * 1984-09-04 1986-09-02 Tachikawa Spring Co., Ltd. Frame molding process of a seat for vehicles
JPH0618326A (ja) * 1992-06-30 1994-01-25 Stanley Electric Co Ltd 生体高分子複合体を用いた光電変換装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 9, No. 139 (M-387) (1862), 14 June 1985; & JP-A-6018326 (Ekuseru K.K.) 30 January 1985 *

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