Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
  • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
  • B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/30—Extrusion nozzles or dies
  • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/30—Extrusion nozzles or dies
  • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
  • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
  • B29C48/336—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging one by one down streams in the die
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
  • B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams

Definitions

• Barrel-like container made of plastic and method and device for its production
• the invention relates to a barrel-like container made from a discontinuously extruded tubular preform made of thermoplastic material in a blow molding process and having a wall consisting of an inner layer, an outer layer and at least one intermediate layer.
• a method and a device for producing a large-volume hollow body for example a barrel, made of plastic with a multilayer wall are known.
• the device consists of an annular piston which can be axially displaced in a housing and acts as a coextrusion head and which has an approximately radial flow channel bore for each layer of the wall and thus for each plastic melt, each of which flows into a belt distributor.
• the belt distributor then passes into a common flow channel into which the individual plastic melts flow one after the other. Which is about in the middle of the ring piston flow channel is gradually expanded to the cross section of an annular storage space acted upon by the annular piston.
• the outer layer of the wall and therefore also the layer of the preform from which the barrel-like container is produced by a blowing process for example for protection against UV rays or provided with a special color for visual reasons.
• a blowing process for example for protection against UV rays or provided with a special color for visual reasons.
• the wall has an axially extending viewing strip made of translucent plastic.
• a container designed in this way makes it possible, on account of the visible strip, for the filling level of the filling material therein to be regularly monitored or checked.
• FIG. 1 shows a perspective illustration of a container according to the invention
• FIG. 2 shows a section through an inventive device for producing a container from FIG. 1
• FIG. 3 shows an enlarged detail from the device from FIG. 2 in the area of the formation of a viewing strip .
• a barrel-like container 1 is shown, which is made of thermoplastic material from a hose-like preform in the blowing process, the wall of which consists of at least three different layers and in the wall of which a viewing strip 2 extending in the axial direction is incorporated.
• the hose-like preform for forming the barrel-like container 1 is produced by means of a device, of which the Rmgkolben Eat 3 or annular piston accumulation head is shown in Figure 2 of the drawing.
• the Rmgkolben appointment 3 initially consists of a storage jacket 4, which is connected in a conventional manner, not shown, with a housing known per se.
• the storage jacket 4, which is arranged in a stationary manner in the illustrated exemplary embodiment, accommodates an axially displaceable annular piston 5, in which a quill 6 is guided axially displaceably with a nozzle mushroom 7.
• a nozzle gap 8 is formed between the storage jacket 4 and the nozzle mushroom 7 and can be opened and closed by an axial displacement of the sleeve 6.
• the sleeve 6 is associated with a drive, not shown, for example in the form of a piston-cylinder unit.
• the annular piston 10 In its end located outside the tank jacket 4 area of the annular piston 10 has three 5 flow channel bores 9, 11 is connected to the respective melt extruders for the different em ⁇ union producti. Via the flow channel bore 10, for example a clear rela ⁇ hung as translucent plastic melt is fed, which forms the so-called inner layer of the to be produced, and thus the tubular Vorformlmgs subsequent container. 1
• the flow channel bore 9 becomes a plastic melt fed, which consists of a recycled plastic.
• the so-called slug material is used for this recycling plastic, which is obtained when the container 1 is blow molded.
• the plastic melt supplied via the flow channel bore 9 forms the so-called intermediate layer of the preform and thus of the later container 1. This intermediate layer is opaque.
• a third plastic melt enters the annular piston 5 via the flow channel bore 11, which is colored and which consists of a UV-stable material. This plastic layer forms the outer layer of the preform and thus of the blown container 1.
• the flow channel bores 9, 10, 11 each first merge into a circumferential ring distributor 12, 13, 14, to each of which an obliquely running ring channel 12a, 13a and 14a connects.
• These ring channels 12a, 13a, 14a open in succession into a common ring channel 15, which gradually widens to the width of an annular storage space 16 in the storage jacket 4.
• the fact that the individual plastic melts are fed in succession to the common ring channel 15 and the same is only gradually expanded to the cross section of the ring storage space 16 ensures that the structure of the individual layers of the multilayer plastic melt is not changed, but is retained. This also applies to the container 1, which is produced from the tubular preform produced in the annular piston accumulator 3.
• a further flow channel bore 17 is provided in the right part of the annular piston 5 and is connected to an extruder. from which a translucent plastic melt is fed to the annular piston 5. If necessary, this flow channel bore 17 can also be connected to the extruder which is connected to the flow channel bore 9. However, it is necessary for the flow channel bore 17 to be preceded by a device by means of which the pressure and the amount of the translucent plastic melt supplied can be precisely controlled.
• the flow channel bore 17 flows radially into the common ring channel 15 at a distance from the obliquely running ring channels 12a, 13a, 14a Layer and the intermediate layer of the multilayer plastic melt split and thus allows the supply of the translucent plastic melt.
• the torpedo 18 extends to the plastic melt forming the inner layer of the preform, which is not colored. Due to the translucent plastic melt supplied via the flow channel bore 17, the outer layer and the intermediate layer em transparent strip is produced in the non-transparent plastic melts, which later forms the visible strip 2 on the blown container 1. It is thus possible to visually check or monitor the fill level of the barrel-like container 1, that is to say without a special measuring device.
• the translucent plastic melt is advantageously not carried out continuously, but rather only the area which later forms the lateral surface of the container 1.
• 1 em viewing strip 2 is required neither in the underbody nor in the upper floor of the container.
• the translucent plastic melt supplied via the flow channel bore 17 must extend to the opposite wall of the common ring channel 15. This means that the torpedo 18 is so long that it can interrupt all three layers of the multilayer plastic melt for supplying the translucent plastic melt for the viewing strip 2.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Packages (AREA)
• Containers Having Bodies Formed In One Piece (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7804256

Family Applications (1)

Country Status (11)

Cited By (2)

Families Citing this family (10)

Citations (7)

Family Cites Families (11)

• 1996
  • 1996-08-31 DE DE19635334A patent/DE19635334A1/de not_active Withdrawn
• 1997
  • 1997-07-29 IN IN455BO1997 patent/IN189558B/en unknown
  • 1997-08-23 CA CA002264196A patent/CA2264196C/en not_active Expired - Fee Related
  • 1997-08-23 ES ES97941820T patent/ES2210574T3/es not_active Expired - Lifetime
  • 1997-08-23 BR BR9711286-0A patent/BR9711286A/pt not_active Application Discontinuation
  • 1997-08-23 AT AT97941820T patent/ATE252974T1/de not_active IP Right Cessation
  • 1997-08-23 JP JP51116498A patent/JP3935214B2/ja not_active Expired - Fee Related
  • 1997-08-23 CN CNB971971765A patent/CN1160179C/zh not_active Expired - Fee Related
  • 1997-08-23 US US09/230,903 patent/US6764639B1/en not_active Expired - Lifetime
  • 1997-08-23 EP EP97941820A patent/EP0923445B1/de not_active Expired - Lifetime
  • 1997-08-23 WO PCT/DE1997/001842 patent/WO1998008668A1/de active IP Right Grant
  • 1997-08-23 DE DE59710927T patent/DE59710927D1/de not_active Expired - Lifetime

Patent Citations (7)

Non-Patent Citations (1)

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