We at Total Food Machines supply a wide range of Multihead Weighers. (MHW) our Multiheads are supplied with the following:
Stainless steel 316
HBM load cells
Multihead Weighers are accurate and fast weighing machines that can pack multiple packs making the production line run effectively. Product is placed into an inlet chute and then distributed into the pool hoppers, the product is then weighed in the hoppers to the customers specified weight. The optimum computer then discharges the product through the discharge chute, the product is then released through the timing mechanism sent by the user.
Pouch Filling machines are made to open, fill and seal a range of pouches in different sizes. Helping in the increase of production and the automatic packing of pouches. Picking, filling, and moving product through the production line.
We can also supply on request VFFS Machines - these are Vertical Form Fill Seal Machines built for addition to an automated assembly line. Your ideal machine for liquid, powder or granule packing.
Consider the multihead configuration based on the main parts of multihead: top cone, level control, linear pan, buckets and discharge chutes.
Top cone: Rotary or Vibrate
Rotary for sticky products, need rotate to spread products to linear pans
Vibrate for granular or non-sticky products, easy to be vibrated to linear pans
Level control: Photosensor or weighing load cell
Photosensor: For light and fluffy product
Weighing load cell: Heavy
Linear pans: Different degree & shape
Flat linear pans: for common dry products
Inclined linear pans: for sticky products, can be 5,10,15 degrees depends on how sticky the products are.
V shape linear pans: for round product by either counting or small weights, controls the products to be fed one by one.
Straight line linear pans: round products, avoid sticking by standard linear pans.
Belt feeder: for easily damaged products, like oranges
Screw feeder: for sticky products: ready meal, fresh/cooked poultry
Single door: 0.8L, 1.6L
Double door: 0.5L, 1.0L, 1.3L, 2.5L,5.0L
Flat bottom bucket: 2.5L, for small granules: rice, sugar etc
Mesh bucket: 1.3L, 2.5L
Scrapping bucket: 1.0L
Inclined degree: standard is 85 degree. Sticky products can use 65 degree or 60 degree depends on how sticky the product is.
Heads numbers: Evaluate by production capacity/speed
10 heads, 12 heads, 14 heads, 16 heads, 20 heads/10x2 heads, 24 heads/12x2 heads, 32 heads
16 heads=2x8 heads; 20 heads=2x10 heads; 24 heads= 2x12 heads; All these types can be used as two weighers to get high speed or with two packaging machine
20 heads/24 heads/32 heads can be used for a mixture of projects.
Standard are MCU control system, can be PLC Siemens or Allen Bradly.
Touch panel: Standard is Weinview options for Siemens or Allen Bradly.
1) Anti-humidity system: Frozen, fresh, low working temperature conditions
2) Anti-rotate device: Prevents products being rotated in the discharge chutes.
3) Silicon pads: For fragile products or metal parts to avoid noise.
4) Touchable surface: Silver Teflon is for regular sticky products. Black coloured Teflon is 380 degree, high grade, anti-sticking.
For irregular / long products: fish, large steak, vegetables like chillis, cucumbers, and carrots...which cannot be processed by regular multiheads we recommend 12 head or 14 head belt scales.
Therefore, to choose the correct MHW for you we have to know the following information:
1) Product (actual photos if possible).
2) Unit weight or dimensions especially if long/large.
3) Target weight.
5) Packaging method: Bag or tray or jars...
1) Package type, with photo
2) Bag/tray/jar/carton dimensions
The principles of a MultiHead Weigher
At a basic level, a multi-head weigher takes bulk product and weighs it into smaller increments according to the weights programmed into its software. That bulk product is fed into the scale through the infeed funnel at the top, generally via an incline conveyor or a bucket elevator
A multihead weigher is a fast, accurate and reliable weighing machine, used in packing both food and non-food products.
A ‘typical target’ weight per pack might be 100 grams of a product. The product is fed to the top of the multihead weigher where it is dispersed to the pool hoppers. Each pool hopper drops the product into a weigh hopper beneath it as soon as the weigh hopper becomes empty.
The weigher’s computer determines the weight of product in each individual weigh hopper and identifies which combination contains the weight closest to the target weight of 100g.
The multihead weigher opens all the hoppers of this combination and the product falls, via a discharge chute, into a bag or, alternatively, into a distribution system which places the product, for example, into trays.
Dispersion is normally by gravity, vibration or centrifugal force, while feeding can be driven by vibration, gravity, belts, or screw systems.
An extra layer of hoppers can be added to store product which has been weighed in the weigh hoppers but not used thus increasing the number of suitable combinations available to the computer and so increasing speed and accuracy.
The range of bags which can be filled using multihead weighers is immense. At one end of the scale are large catering packs of many kilogrammes. At the other are small bags of crisps which can be handled at high speed and efficiency.
Products containing up to eight components can be mixed on a multihead weigher, very accurately at high speeds. The weigher is divided into sections, each with its own infeed. For example, a breakfast cereal containing hazelnuts and dried fruit plus two relatively cheap ingredients, could be weighed on a multihead with say eight heads devoted to each of the more expensive components and four heads to each of the other two. This would ensure high weighing speed while ensuring that overfilling of the expensive ingredients was negligible.
A well-engineered distribution system enables you to combine the speed and accuracy of multihead weighing with precise, splash-free delivery of product into trays.
Multihead weighers were used initially for weighing certain vegetables. Their use expanded exponentially in the 1970s and 1980s when they were applied to the rapid weighing of snacks and confectionery into bags. What cherry tomatoes and crisps had in common was that they flowed easily through the machine and into the pack, with no more encouragement than gravity and a moderate level of vibration of the feeders. Since then, the accuracy and relative speed have been extended to many products which would in the early days of the technology have been seen as difficult to handle.
Fresh meat and fish, whether in a sauce or not, poultry and cheese (including grated cheese) can be moved along by using belts or screw feeders rather than vibration.
Granules and powders
While free-flowing, fine-grained powders can be weighed more cheaply by other means (such as cut-gate or linear weighers, or volumetric feeders), granules such as coffee granules and products such as loose tea can be weighed on today’s multiheads.
Weighers with more shallow angles of descent and various cushioned inserts have made it possible to pack delicate and brittle items such as hand-made chocolates and gourmet biscuits. These are often paired with baggers or other packaging systems designed to handle fragile products.
Using mix-weighing combined with a distribution system tailored to deliver separate components into a tray, a ready meal can be assembled with just the right quantities of, say, rice, meat and vegetables in the appropriate compartments.
For further information contact Total Food Machines