Come Preparare il Gesso per la Ceramica. Super Facile!

CeramicaPerTutti

10 Jan 202104:14

Summary

TLDRIn today's video, we explore the process of creating liquid clay for making plaster molds. We'll use alabaster plaster, which has a 0.7 to 1 water-gypsum ratio. The key is to pour the clay into the water, not the other way around, and mix until no lumps remain. Once the mixture is ready, it's poured into a container coated with wax to ensure easy removal after drying. The video emphasizes the importance of following the manufacturer's proportions and the right pouring technique for successful plaster molding in ceramics.

Takeaways

🎨 Creating a liquid clay mixture is essential for making plaster molds and stamps.
🏺 The script introduces the use of alabaster plaster and a specific clay product with a water-to-gypsum ratio of 0.7 to 1.
💧 Always pour the clay into the water, not the other way around, to ensure proper mixing.
🛠️ Gradually add the plaster to the water, allowing it to be absorbed evenly.
📏 Measure the plaster beforehand or use the 'water puddle' method to determine when to stop adding more plaster.
🌊 A 'water puddle' forms when the mixture no longer absorbs plaster, indicating it's time to add more.
🥄 Continue to add plaster in small amounts until the desired consistency is reached.
🔨 Use a wooden stick to stir and help the plaster absorb into the water if it's not being absorbed at the same rate.
🚰 Mix the plaster thoroughly, either by hand or with an electric mixer, to ensure there are no lumps.
🧴 Prepare the plastic container with Vaseline to facilitate easy removal of the dried plaster.
🕒 Allow the mixture to solidify for about half an hour before handling.
🎥 The video also encourages viewers to like, share, and subscribe for more content on ceramics.

Q & A

What is the main topic of the video?
-The main topic of the video is creating a liquid clay mixture for making plaster molds using the slab technique.
Which type of plaster is used in the video?
-The video uses alabaster plaster.
What is the water-to-gypsum ratio for the plaster used in the video?
-The water-to-gypsum ratio is 0.7 to 1, meaning 0.7 liters of water per kilogram of plaster.
How should the plaster be mixed with water?
-The plaster should be poured into the water, not the other way around, and done gradually to ensure even distribution and absorption.
What is a sign that the plaster has reached its absorption limit?
-A sign is the formation of a 'water feather' or 'montagnetta' on the surface of the water, indicating that the plaster can no longer be absorbed at the same rate.
How can you tell if the plaster mixture is ready?
-The plaster mixture is ready when it has absorbed all the water and there are no more air bubbles on the surface.
What is the purpose of greasing the plastic container with vaseline before pouring the plaster mixture?
-Vaseline is used to grease the container so that the plaster can be easily removed once it is dry.
How long does it take for the plaster mixture to solidify?
-It takes about half an hour for the plaster mixture to solidify.
What can be done with the plaster slab after it has been removed from the container?
-After removing the plaster slab from the container, it can be modified or refined with a simple spatula while it is still soft for the next two to three hours.
What is the importance of following the manufacturer's proportions for the plaster?
-Following the manufacturer's proportions is crucial for achieving the desired consistency and performance of the plaster mixture.
What is the main passion of the video creator that they mention at the end of the video?
-The video creator's main passion is ceramics.

Outlines

00:00

🎨 Creating Liquid Clay for Plaster Molds

This paragraph outlines the process of creating liquid clay for plaster molds. It begins by explaining the importance of using the correct proportions of water and plaster, specifically a 0.7 water to plaster ratio. The speaker then demonstrates how to slowly pour the plaster into the water, ensuring that the plaster is fully absorbed and forms a 'water hillock'. The process continues until the plaster no longer absorbs water at the same rate, indicating that it's time to mix the mixture either by hand or with an electric mixer. The final step involves pouring the mixture into a plastic container coated with wax to ensure easy removal once dried. The paragraph emphasizes the simplicity of creating a plaster mold and encourages viewers to follow the manufacturer's proportions for the plaster.

Mindmap

Keywords

💡liquid casting

Liquid casting is a process used in various art forms, including ceramics, where a liquid material like plaster is poured into a mold to create a solid object. In the video, the main focus is on creating a liquid casting mixture using plaster and water to form molds for ceramic plates. The script describes the importance of the water-to-gypsum ratio and the method of mixing to achieve the desired consistency for casting.

💡plaster molds

Plaster molds are forms used in the creation of various objects, such as ceramic plates, by casting liquid materials like plaster into them. The video script details the process of making plaster molds, emphasizing the technique of pouring plaster into water to create a casting mixture that can be used to form the desired molds. The plaster molds are essential for the final product's shape and design.

💡gypsum (alabaster plaster)

Gypsum, also known as alabaster plaster, is a material used in the creation of plaster molds due to its setting properties and durability. In the context of the video, the script specifies the use of alabaster plaster for creating liquid casting mixtures. The plaster's properties, such as its water absorption rate and setting time, are crucial for the success of the casting process.

💡water-to-gypsum ratio

The water-to-gypsum ratio is a critical aspect of creating plaster molds, as it determines the consistency and workability of the plaster mixture. The video script emphasizes the importance of this ratio, specifying a ratio of 0.7 liters of water to 1 kilogram of gypsum for the liquid casting mixture. Achieving the correct ratio ensures that the plaster sets properly and is suitable for casting.

💡mixing technique

Mixing technique refers to the method of combining materials, such as plaster and water, to achieve a homogenous mixture suitable for casting. In the video, the script outlines the proper technique for mixing plaster and water, including pouring plaster into water gradually and stirring to eliminate air bubbles and ensure even consistency. The technique is vital for the success of the casting process and the quality of the final product.

💡absorption

Absorption in the context of the video refers to the process of water absorbing the plaster to form a solid mixture for casting. The rate of absorption is crucial, as it indicates when to add more plaster to the mixture. The script describes observing the water's ability to absorb plaster and adjusting the addition of plaster accordingly to achieve the desired consistency for casting.

💡water mountain

A 'water mountain' is a term used in the video to describe a phenomenon that occurs when the water can no longer absorb more plaster, and a mound or pile of plaster forms on the water's surface. This indicates that the plaster has reached its maximum absorption point and that additional plaster can be added to the mixture to continue the casting process.

💡stirring

Stirring is the process of mixing the plaster and water to ensure a uniform consistency without introducing air bubbles. In the video, the script describes the importance of stirring the mixture, both manually and with an electric mixer, to achieve a smooth casting mixture. Proper stirring is essential for the quality of the plaster mold and the final product.

💡container preparation

Container preparation involves preparing the container that will hold the liquid casting mixture before it solidifies. In the video, the script specifies the use of a plastic container that has been previously coated with wax or petroleum jelly to allow for easy removal of the hardened plaster. This step is crucial for ensuring that the plaster mold can be removed and used effectively.

💡solidification

Solidification is the process by which a liquid casting mixture transitions from a liquid state to a solid form. In the context of the video, the script explains that the plaster mixture will solidify after being left to sit for approximately half an hour. The solidification process is essential for creating a usable plaster mold for ceramic plate production.

💡ceramics

Ceramics is the art of creating objects such as pottery and porcelain, often using materials like clay and plaster. In the video, the main theme revolves around creating plaster molds for ceramic plates, making ceramics the central focus. The script emphasizes the passion for ceramics and the various techniques involved in producing high-quality ceramic pieces.

Highlights

Creating a liquid clay mixture for making plaster molds using the slab technique.

Utilizing alabaster plaster for its suitability for the purpose.

The plaster has a water-to-gypsum ratio of 0.7 to 1.

Pouring the plaster into water slowly and carefully.

Always pour the plaster into the water, not the water into the plaster.

Distributing the plaster evenly across the water's surface.

Observing the plaster sinking into the water and adjusting the addition rate.

Identifying when the water no longer absorbs plaster by the formation of a 'water feather'.

Adding more plaster once the 'water feather' is observed.

Using a wooden stick to stir and ensure complete absorption of plaster by the water.

Mixing the plaster mixture by hand or with an electric mixer to eliminate lumps.

Pouring the mixture into a plastic container previously greased with wax for easy removal.

Allowing the mixture to solidify for about half an hour.

Removing the hardened plaster form by gently pulling the container apart.

The plaster form remains soft for the next two to three hours and can be modified or refined.

Emphasizing the simplicity of creating a plaster mold.

Encouraging viewers to read the plaster manufacturer's proportions and instructions.

Sharing the video on the creator's passion for ceramics.