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
  • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
  • B29C39/14—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D19/00—Producing buttons or semi-finished parts of buttons

Definitions

• the invention relates to a device for producing rods, in particular as a starting material for buttons, made of curable material such as plastic or casting resin, with a shape essentially designed as a tube for receiving the liquid or viscous material.
• the procedure was previously that the material was poured into an inclined tube. The material was allowed to harden within the tube, shrinking so that it could subsequently be pushed out of the tube. By pouring materials of different colors, patterns could be created more or less randomly. The hardened primary material was then cut into small plates, which were provided with holes for the buttonholes.
• a disadvantage is that there are relatively large sections at both the lower and the upper end of the rods that cannot be used: in the lower area, the color mixing is generally still incomplete, while a blow hopper forms at the upper end, which must also be cut off as waste.
• the invention is based on the object of providing a device of the type outlined at the outset which permits the continuous production of rod-shaped primary material.
• this object is achieved in the device described in that a carrier tape runs axially through the tube, which takes the form of a tube within the tube with overlapping longitudinal edges, and that a feed tube enters the tube in the entrance region of the tube for the liquid or viscous material flows. It is advantageous if the carrier tape is an endless tape that is guided over a drive roller and a tension roller.
• the invention has the considerable advantage over the previously known prior art that an entrained casting mold for the rod profile to be produced is produced within the tube, which opens again after exiting the tube and exposes the rod material thus produced. After curing, the material can be cut to length, stored or further processed. With the aid of the device according to the invention, numerous materials can be processed, for example multi-component resins or plastics which cannot be extruded.
• a core element engages in the hose behind the mouth of the feed pipe in the direction of flow.
• This can consist, for example, of a piercing mandrel in order to already incorporate the buttonholes during the production of the raw material for buttons during the continuous production of the raw material.
• the invention opens up the possibility of arranging further feed pipes within the feed pipe, for example in order to feed materials with different colors and to produce a multi-colored rod material.
• the mouth of the additional feed pipe extends beyond the mouth of the first feed pipe, the projection formed thereby being able to be changed.
• the material entered through the additional feed pipe mixes with the material of the material fed through the first feed pipe in a stage of relatively little hardening, while with increasing protrusion the additional material fed in contact with the material fed through the first feed pipe ⁇ NEN material in an already advanced degree of curing.
• the boundary between the two materials is relatively blurred and flowing, while in the second case, very sharp boundaries are created between the materials.
• buttons can be produced which have differently colored areas, for example dots.
• the feed tube or the feed tubes are connected in front of the input region of the tube to a respective mixing device which has at least two containers for receiving the materials to be mixed, which have metering pumps with one to the feed tube connected mixer are connected.
• a water bath, an induction coil, microwaves or the like can serve as heat sources.
• the diameter of the tube is variable.
• thick or thin rods can be produced as starting material, which are generally cylindrical, as required.
• tubes with an oval or angular cross section can be used. The adaptation of the diameter and the cross-section to the respective requirements can be achieved by installing the corresponding tube or by changing the cross-section on an installed tube.
• FIG. 1 shows the schematic view of a device according to the invention
• FIG. 2 shows a longitudinal section through the entrance area of the tube with the mouth of two feed tubes
• Figure 3 shows a cross section in the plane III-III of Figures 2 and
• Figure 4 is a schematic view of another embodiment of the device.
• an endless carrier belt 14 is guided over a drive roller 10 and a tension roller 12, which is elastically deformable and can be made of plastic or metal.
• the upper run of the carrier tape 14 is passed through a tube 16, the diameter of which is smaller than the width of the carrier tape 14. The condition arises for a width b of the carrier tape 14 and an inside diameter d of the tube 16
• the mouth 24 of a feed tube 26 engages in the tube 18 and is sealed against the inside of the tube 18 via a sealing ring 28.
• the material to be processed is introduced into the tube 16 in a liquid or viscous form by means of pressure, suction or gravity via the feed tube 26 in a manner not shown in further detail. Due to its continuous movement, this pulls the material from the mouth 24 of the feed pipe 26.
• the material which sets and hardens within the pipe 1 6 comes out of the pipe 1 6 again as a rod 30.
• the rod-shaped primary material can be cut to length, for example for the production of platelets or buttons.
• the pipe 16 can be heated to accelerate the setting and hardening process, the possible heat sources for this not being shown any further.
• the output can also be influenced by the length of the tube 16 and the transport speed of the carrier tape 14.
• a further feed pipe 32 engages in the feed pipe 26, the diameter of which is smaller than the diameter of the first feed pipe 26.
• the mouth 34 of this second feed pipe 32 protrudes, as shown in FIG. 2, beyond the mouth 24 of the first feed pipe 26, as a result of which a protrusion a is formed.
• the length of the overhang a can influence the transition area between the two colors, a small overhang a resulting in an unsharp edge area, while a larger overhang a - due to the different hardening of the material - creates a sharp edge area .
• Figures 2 and 3 show that a core element 36 engages in the tube 18 in the direction of passage behind the mouth 24 of the outer feed tube 26.
• the core element 36 here consists of two perforated mandrels 38, the ends of which facing the mouth 24 are connected to one another by a web 40.
• the material which has not yet hardened and flows through the inner feed tube 32 flows around the core element 36, the two piercing mandrels 38 forming the desired button holes.
• mouthpieces (not shown) with channels for the material can be placed on the mouth 34 of the inner feed tube 32 and / or on the mouth 24 of the outer feed tube 26.
• the pouring process is started via a plug, not shown, which is adapted to the shape of the tube 16 and is inserted into the entrance area 22.
• the mouth 24 of the feed tube 32 - or the mouth 34 of the inner feed tube 32 - is placed in front of these plugs, whereupon the material is then introduced into the hose 18.
• the material then pushes the plug through the tube 16 so that it can be removed at the outlet of the tube 16.
• the material that then emerges has the shape of the rod 30, which can then be stored, processed or cut to length.
• the device 'according to the invention is arranged essentially horizontally.
• the same pattern for the Rods are produced as in the inclined tubes of the prior art.
• the device according to the invention has the advantage over the prior art that components, for example a hardener, can be admixed directly before the mouth of the feed pipe or pipes. This makes it possible to use very small containers, for example for trials or for the production of special orders. This has not been possible until now, since a complete batch with the already finished mixture always had to be poured into the inclined pipes of the device according to the prior art explained at the beginning.
• components for example a hardener
• FIG. 4 shows a device in which three further feed pipes 32, 32 ′ and 32 ′′ open into the entry area 22 of the pipe 1 6 in addition to the feed pipe 26.
• each feed pipe is connected to a mixing device 42, which at least has two containers 44, 46.
• the container 44 serves here, for example, to hold the hardenable plastic or casting resin, while the container 46 receives a material to be mixed therewith or the hardener .
• Each container 44, 46 is connected to a mixer 50 via a metering pump 48 , which in turn is connected to the associated feed pipe 26 or 32, 32 'and 32 ".
• Each container 44, 46 can be heated via a heater 52.
• the device shown in FIG. 4 enables the material and the hardener or other components to be previously heated separately in the respective container 44, 46 and only to be mixed immediately before the inlet area 22 of the tube 16. This eliminates the need to mix the individual components together beforehand, and the casting process can be interrupted at any time as required, without a large amount of already mixed material becoming waste.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)
• Moulding By Coating Moulds (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=6461340

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Family Cites Families (4)

• 1992
  • 1992-06-19 DE DE19924220031 patent/DE4220031A1/de not_active Withdrawn
• 1993
  • 1993-06-18 SI SI9300326A patent/SI9300326A/sl unknown
  • 1993-06-18 WO PCT/EP1993/001563 patent/WO1994000283A1/de not_active Application Discontinuation
  • 1993-06-18 AU AU43274/93A patent/AU4327493A/en not_active Abandoned
  • 1993-06-18 EP EP93913013A patent/EP0634968A1/de not_active Withdrawn
  • 1993-07-16 TW TW82105685A patent/TW224957B/zh active

Non-Patent Citations (1)

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