What Are Printing Plates And Cutting Dies?
Time to read 6 min
Time to read 6 min
Commonly referred to as "tooling", Printing Plates and Cutting Dies are one-time upfront costs needed to produce some products in the corrugated industry. They are large up-front costs that businesses need to invest in to make their corrugated products. Cutting dies are like a large cookie cutter, and printing plates are like a large stamp.
When a new customer tries to make their first purchase of corrugated packaging or POP Displays, they will often see large line item costs. Things called Printing Plates and Cutting Dies.
Let's dig into what these two items are so you are able to make a more informed decision.
These are simply tools used for the mass production of corrugated products.
Table Of Contents
Printing Plates are made from metal or polymer materials. These plates are pressed into a sheet of material to give it the appearance of being printed. They print designs onto packaging in large volume on manufacturing equipment. Almost like a large stamp, some plates can print over 1-million boxes before needing to be replaced.
The most common types of printing plates are letterpress plates which have raised elements that transfer ink onto the substrate creating an impression, this is similar to how you would press your finger into soft mud or clay leaving an impression.
Ink is then rolled over the top of the plate transferring ink through the image which has been transferred from the image on the print plate.
Typically these can take anywhere from 6-8 Weeks to produce. They are made from special manufacturers, not the corrugated manufacturers. So all of these vendors must work together to serve the customer's needs.
Flexographic printing plates are photopolymer plates that are flexible and are used in flexo printing to transfer ink and pictures on a flexible substrate like paper or film. The printing plates are an important part of the flexographic printing process, and the quality of the printed image is heavily influenced by the flexo plates used.
The flexo technique is well-known for its ability to print on a variety of flexible substrates and for the plates' ability to be reused over millions of impressions. The plates are created in relief, which means that where the picture has been exposed, the print surface is elevated.
After the ink is placed to the plate, the only region that comes into touch with the substrate is the plate surface. The ink does not come into touch with the etched or relieved regions.
Flexo plates were originally composed of rubber, but they are now constructed of photopolymer material in sheet form, which distinguishes them from offset printing's fixed metallic printing plates.
The plates are flexible enough to wrap around print/plate rollers that are cylindrical.
Other types of printing include lithographic plates where images are etched onto metal plates which reproduce high quality imagery with precise line definition at very high speeds.
Lithographic plates are a very economical solution for printing high quality images on substrate materials.
What's special about this printing method is there are no printing plates. Digital Printing has ink ready to print in the machine, and combines as needed. That takes a huge cost out of the equation and its helps speed up the production process.
Today, printing plates are made from a variety of ways depending on the vendor.
A laser imagesetter is used to expose the appropriate picture onto a film negative. It is then put directly on the unexposed plate material's surface and kept in place by a vacuum cover.
The picture is then fixed into the polymer substance by exposing the plate and film to UV light. UV light can only travel through the transparent regions of the negative film. It allows the UV rays to change the molecular bonding in the photopolymer substance.
The plate is then mounted to an oscillating platen and immersed in a washout tank after appropriate exposure time. Depending on the kind of plate material, the washout solution might be either water or a solvent.
A washout brush is used to remove the unexposed parts of the polymer from the plate base. The waste polymer is dissolved in the washout solution, which is subsequently processed for solvent reclamation and recycling.
After the washout, the plate is placed in a hot air drier to evaporate any excess water or solvent, leaving a dry plate. Finally, a post cure utilizing both UVA and UVC lamps is necessary, and the completed plate is ready to use.
Direct 'computer-to-plate' technology is now used to expose the majority of flexo plates (CTP). The film negative is pre-laminated onto the photopolymer sheet in this process. It allows both layers to be exposed in the same piece of equipment.
A computer directs a laser to expose the negative layer first, followed by the photopolymer being exposed to the UVA light source. When compared to the usual procedure, this exposure technique creates a higher-quality plate. The exposed plate is subsequently treated using the above-mentioned washout procedure.
This processing removes the need for water or solvent in the etching process. The photopolymer's unexposed portions are effectively melted and removed using a mechanical process. It involves heat treatment and a series of revolving rollers.
This procedure is considered to be less harmful to the environment than traditional plate washing processing.
Related: Litho vs Digital Printing
Cutting Dies are large pieces of tooling made of blades, plastic, rubber, and more. They are applied to the manufacturing equipment that cuts corrugated at high speeds, and are the negative for the desired box shape. This tooling typically lasts years and is good for multiple uses.
Cutting dies are not normally required for basic shipping boxes (RSCs, HSCs, FOLs, OPFs, and 5PFs), pads, or scored sheets. That's because these packaging styles are so common that most manufacturers have tooling already. Anything that goes beyond the capability of normal box-making technology, on the other hand, does.
Mailer boxes, POP displays, custom inserts, boxes with cutouts and windows, and most trays fall within this category. A cutting die charge will be added to your quote for these goods. This is a one-time cost to purchase the die, which may be used on subsequent orders.
It typically takes 6-8 Weeks to create cutting dies for manufacturing. This is done from special vendors that must work together with corrugated manufacturers to service the customer.
Cutting dies consist of three components: the die block, a slug, and a backer board. The die block is the metal piece that creates the shape, the slug is an unfinished part of the shape left behind after cutting which can be recycled later to make new dies, and the backer board consists of two material sheets laminated together with a wood core in between them giving it strength.
Die cut boxes are corrugated cardboard boxes that may be customized to meet any shape, size, or demand. Die cut boxes are made from simple sheets of corrugated material and are cut using a machine called a die press (or die cutter).
Engineers or design professionals design the die cut boxes first, then the die press is set up and equipped to cut the cardboard. After the boxes have been cut, distinctive visuals such as product information, warnings, or branded logos may be added to further personalize them.
Because fully customized boxes are generally somewhat more costly than conventional sized and shaped boxes, the concept that they might save your firm money seems counterintuitive. Die cut boxes, on the other hand, can save you a lot of money in the long run.
Any unused space in a shipping truck, rail car, or airplane cargo bay is nothing more than a waste of money when items are delivered. Despite the fact that most carriers ship by weight rather than volume, wasted space means less goods is transported each load.
Die-cut boxes are tailored to suit your product more precisely than normal shipping boxes. Not only does this reduce the amount of wasted space during shipment, but it also eliminates the need for additional packing materials, such as foam packaging peanuts, to cover the empty space; another cost-cutting element.
Related: Custom Shipping Boxes vs Stock Boxes
While the cost of a larger load is likely to be higher, your products may be shipped in fewer loads.
Print Plates & Cutting Dies are tools used by corrugated manufacturers throughout North America to produce their products. Without these tools it would be impossible for any corrugated packaging manufacturer to produce at high speeds or low costs.
As you can see, there are several uses for printing plates and cutting dies in the world of corrugated boxes. Talk with our team if you have any questions on how these tools are used or what is involved in their creation.