Combination Machines for composite cans

Combination Machines for Composite Cans

Overview

VRMK3 Combination Machine for composite cans
LFM-4 Combination Machine for composite cans

For the processing of spiral-wound can bodies into composite cans, Blema has developed several compact, modular high-performance machines.

For example, for the production of snack cans (stacked chips), the following operations are performed integrally in one machine:

1. Flanging on the top side of the can body

2. Heat-Sealing a flat membrane

3. Applying a snap-on lid

Two main types of machinery are available

LFM-4

fully automatic rotary indexed machine for medium speed applications

VRMK3

fully automatic continuously operating machine in turret construction for high performance applications

LFM-4 - Design and Function

LFM-4 Layout

Layout

A – star wheel transfer unit

B – 2 feed conveyor belts

C – entry

D - infeed star wheel

E – can body processing machine LFM

F – discharge star wheel

G – lid feed belt

H – discharge belt

I – off-transport belt

J – foil web unreeling

K - control cabinet

L - foil waste container

Design and Function

rotary indexing machine with dual working stations

  • can infeed from dual lane conveyor via infeed star wheel
  • lubrication of the can bodies
  • pushing-in to the main turret
  • beading station for the unilateral processing of the can bodies on the top end

    • pre-beading
    • final beading

  • membrane blanking unit (dual punch)
  • transferring of membranes via vacuum grippers
  • heat-sealing station for safe closing of the cans

    • pre-sealing
    • final sealing

  • pushing-off the cans
  • feeding the snap-on lids by means of a transport belt
  • applying the snap-on lids onto the can
  • flanging the cans on the lower side
  • discharging the cans onto the exit conveyor

VRMK3 - Design and Function

modular forming and sealing machine for composite cans with continuous working principle in turret design

  • modular system which can be easily adapted to different operations and output speeds
  • turret principle enables long sealing time
  • einfache Anpassung an verschiedene Operationen und Geschwindigkeiten
  • Karussellprinzip - lange Siegelzeiten und gleichbleibende Siegeltemperaturen während des Produktionsprozesses
  • cam-controlled lifter movements

functions

  • fast format change

    • fully automatic height adjustment without change parts
    • excellent access to the tooling area
    • extremely short changeover times using pre-set working heads

  • very low maintenance expenditure
  • long operating times and trouble-free production due to

    • cam driven robust active parts
    • high-precision linear guides
    • insulation of the tooling and the guidance using high quality thermo-resistant polymeric material

  • process monitoring and control of all machine parameters

    • adjustable sealing pressure for all tools
    • automatic temperature control in each head; separate for inner and outer parts
    • automatical ejection of faulty cans / bodies

  • quality control (optional):

    • no initiation of sealing process while can body or lid is missing
    • overheat protection during sealing process
    • camera inspection system

safety

  • safety enclosure with mechanical or magnetic door switches

VRMK3 - Modules

Infeed

  • separating the can bodies by a driven dosing star with integrated monitoring unit
  • accelerating the can bodies by a double infeed screw and transferring to the first module by an infeed star

Module 1 - Flanging

  • beading at the upper end of the can with heated or unheated die flanging tools
  • die flanging or calibrating at the lower end of the can
  • axial fixing of the cans by vacuum suction or mechanical ejection with segmented tools

Modul 2 - Membrane manufacturing and heat-sealing

  • with integrated or external membrane manufacturing unit

    • external: feeding of drawn membranes via belt or air conveyor
    • integrated:

      • unreeling with loop control
      • tab cutting from reel and tab heat-sealing to the membrane
      • single servo die cutter
      • with or without scoreline

  • feeding of membranes to the sealing turret via dosing star
  • inserting the deep drawn membrane cups into the can
  • heat-sealing of membrane and can wall with heat contact technology

Modul 3 - Application of snap-on lid

  • bending downwards of the stay-on tab
  • feeding the plastic snap-on lids by means of a conveyor belt

    • optionally an automatic cap sorter with bunker is available

  • applying the snap-on lid to the can

Discharge

  • controlled transfer of the finished cans to the discharge belt by means of a double transport screw
  • pneumatic ejection unit for faulty cans

    • optional with camera control

Technical Data

COMBINATION MACHINESlfm-4VRMK3
no. of stations128
performancemax. 80 cans / min.max. 160 cans / min.max. 400 cans / min.
can diameterØ 65 ... 127 mmØ 65 ... 73 mmØ 52 ... 99 mm
can heights100 ... 250 mm80 ... 300 mm
sealing timemin. 0.6 s (pre- and final sealing)min. 0.6 s
can wall thickness0.7 ... 1.0 mm

material specification (can)

paper composite with label
material specification (membrane)

aluminum with sealing layer

plastic

pneumatic connection6 bar