Why You Need a Pre-Press Mold and How to Use It

January 14, 2022

Do I really need a pre-press mold?

Pre-press molds are used to prepare your material for extraction.
So let's start from what happens if you don't pre-press your material.
When adding a loose material into a filter pouch, no matter how hard you try, you end up having an unevenly filled bag with a lot of tiny air pockets that, when pressed, trap rosin inside instead of pushing it out of the flower mass and through the mesh. When pressing unevenly filled bag, you don't apply pressure equally on each portion of the bag. The tightly filled area receive more pressure from the plates, while the loosely fit parts - not enough pressure to squeeze the juice. In addition to not producing rosin, those loose areas actually work as tiny basins that collect rosin flowing there from tightly filled parts, and, as the result, they end up trapping even more rosin. Moreover, if your pouch is not filled fully and evenly, the bag itself will trap rosin along the edges and inside the seams simply because those essentially empty areas work the same way as the air pockets inside your material.
All those factors negatively affect your yield. So to avoid loosing your precious rosin and increase production, you have to pre-press.
In our opinion, the only time when pre-pressing is not necessary is when you squish a very small amount; in this case the difference in yield will be insignificant and can thus be ignored.

How do you select a pre-press mold?

The most commonly used pre-press molds are rectangular (including square) and cylindrical ones. You should select a mold that matches your filter bags' shape and size. For example, if you work with 1.75 x 5 inch rectangular bags, a 2 x 4 inch rectangular mold will be a good fit for them. For more spacious 2 x 5, 2 x 6 filter bags we recommend using a larger 2 x 6 inch mold.

How do you use a pre-press mold?

First of all, when you receive your pre-press mold, please wash it with soap and hot water and dry it thoroughly to remove any residue left from manufacturing to avoid contamination.
Next, please make sure that your plant is stored at 62% RH level.
To prep your flower, remove large stems and, if necessary, break up the buds into smaller pieces. Wear gloves to avoid smudging oil on your fingers.
Pack your flower into a filter bag. Our filter bags come with a plastic packing card that speeds up the process. Don't overfill your bag; your puck should not be thicker than 1/2 inch.
Place the mold base on a sturdy level surface. If you are not using a filter bag, line the mold with a piece of parchment paper to prevent resin from sticking to the bottom of the form.
Position the mold's hollow chamber on top of the base and place the bag inside. If you are not using a mesh pouch, just fill up the chamber with the prepared flower and top it with a piece of parchment paper.
Cover the mold with the top piece and, using the palms of your hands, apply your upper body weight to compress the flower. Alternatively, you can place the mold between arbor press plates or use our manual press to gently compact the herbs.
Once done, flip the mold upside down, remove the base, and take out your material. Now fold the open end of the filter bag, and, voila, your puck is ready for pressing!

Today we would like to intriduce some of our most popular pre-press molds to you.

ECO Farm Rosin Pre Press Mold 2*4 Inch Heat Press Plate Kits

1. 2 * 4 inch preheating mold, the most practical size
2. The base and frame are designed with strong magnetic attraction, which is not easy to fall off
3. The upper and lower plates are slightly larger than the frame for easy removal
4. Gold + black contrast color design, better visual effect
5. Inside with yarn bag, simple and convenient


ECO Farm 2 *4 Inch Rosin Pre-Press Molds For DIY Extraction & Pressin

  • Perfect Size :2x4inch is the most popular size, perfect for 3x5 plates kits
  • Excellent Design:3Pieces Plate Design, perfect for Oil Pressing
  • Very well made and it presses your flower with ease
  • Pucks fit inside the bag size-matched for the mold size
  • Recommend to Prepress with An Arbor Press or A Bar Clamp


ECO Farm Round Rosin Pre-Press Mold 3*12 cm

  • POPULAR SIZE: The internal diameter is 30mm; good to work with 2"x3" or 2"x4" filter bags or bigger size for bottle tech if needed.
  • SLICK & SAFE: Consists of three parts made of food-grade 304 stainless steel; comes with a bonus drawstring bag.
  • HIGH QUALITY: Small clearance and smooth surface between the mold and ram; easy to load and unload; won't get stuck during the process.
  • EFFICIENCY: Compacted indoor growing plants s increase extraction yield, save time, and reduce filter bag blowouts during heat pressing.


If you want to know more about other pre-press molds please visit our website: ecofarm.ca

Our emails address is: business@ecofarm.ca


WhatsApp: +1 206 581 5521

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