Usamos hilo encerado en el telar de encuadernación.

Because Spanish often leaves subject pronouns out when the verb ending already shows who is doing the action.

• Usamos already tells you it is we
• So nosotros usamos is usually unnecessary

You can add nosotros for emphasis, contrast, or clarity:

• Nosotros usamos hilo encerado, pero ellos no.
  = We use waxed thread, but they do not.

In a neutral sentence, leaving it out is the most natural choice.

Usamos can be two different forms:

• present indicative: we use
• preterite: we used

So by itself, usamos is ambiguous.

In this sentence, it will usually be understood as present because the sentence sounds like a general statement about what is used in a process:

• Usamos hilo encerado en el telar de encuadernación.
  = We use waxed thread on the bookbinding frame.

If the surrounding context were about a finished past action, it could also mean we used.

Spanish often leaves out the article when talking about a material or thing in a general, non-specific way, especially after verbs like usar.

So:

• Usamos hilo encerado = We use waxed thread
  (waxed thread as a type of material)

Compare:

• Usamos un hilo encerado = We use a waxed thread / one waxed thread
  (less natural unless you mean one particular piece/unit)
• Usamos el hilo encerado = We use the waxed thread
  (a specific one already known in context)

Here, no article makes the sentence sound general and natural.

Encerado comes from the verb encerar, meaning to wax.

Here, encerado is a past participle used as an adjective, so it means:

• hilo encerado = waxed thread

It agrees with hilo, which is masculine singular:

• hilo encerado = masculine singular
• hilos encerados = masculine plural

So this is the same kind of structure as:

• papel reciclado = recycled paper
• cuero teñido = dyed leather

The preposition en is very common for location and can often mean in, on, or at, depending on the noun and the situation.

Here, en el telar de encuadernación means something like:

• on the bookbinding frame
• at the bookbinding frame
• in the bookbinding setup

Why not the others?

• al telar usually suggests movement to the loom/frame
• sobre el telar literally means on top of the loom/frame and can sound more physically literal
• en el telar is the most natural general choice for where the thread is being used in the process

No. En el is just en + el written as two words.

Spanish only has two mandatory contractions with el:

• a + el = al
• de + el = del

So:

• en el telar is correct
• not a contraction

This is a very common point for learners because English speakers often expect more contractions than Spanish actually has.

Literally, it is something like:

• telar = loom / frame
• de encuadernación = for binding / of bookbinding

So the full phrase means a bookbinding frame or bookbinding sewing frame.

The structure noun + de + noun is very common in Spanish. It often shows:

• type
• purpose
• field
• material
• relationship

Examples:

• mesa de cocina = kitchen table
• libro de texto = textbook
• máquina de coser = sewing machine

So telar de encuadernación means a kind of telar used in bookbinding.

Not always. Its basic meaning is loom, but in specialized contexts it can refer to a frame used for similar structured work.

In bookbinding, telar can refer to the frame used for sewing or supporting the binding process. So if you only know telar as a textile loom, this use may feel surprising, but it is normal in craft/technical vocabulary.

So here, think of it as a bookbinding frame rather than a cloth-making loom.

Yes. Utilizamos hilo encerado en el telar de encuadernación is grammatically correct.

The difference is mainly style:

• usar = more everyday, shorter, very common
• utilizar = a bit more formal or technical in some contexts

In this sentence, usamos sounds very natural and straightforward.
Utilizamos is also fine, but slightly more formal.

This is the most neutral order:

• Usamos = verb
• hilo encerado = direct object
• en el telar de encuadernación = prepositional phrase giving context/location

Spanish word order is flexible, but this version sounds natural and clear.

Other orders are possible, but they shift emphasis:

• En el telar de encuadernación usamos hilo encerado.
  This emphasizes the place/context first.
• Hilo encerado usamos en el telar de encuadernación.
  This sounds marked or contrastive, not neutral.

So the original sentence uses the most standard, unmarked order.