Drytac HOT PRESS HGP220 User Manual - Page 10

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HOT PRESS USERS MANUAL

RINCIPLES OF

PERATION

Your Hot Press Glass Top Vacuum Press is precision

engineered to deliver the optimum heat and pressure for

a variety of mounting and overlaminating applications. A

conductive coating is applied to the upper surface of the

lower of two sheets of tempered glass that form the lid

of the press. When an electrical current is applied to the

coating, the glass heats up in a very even and consistent

manner.

When the lid is closed onto the gasket around the

outside of the bottom frame, it forms an airtight chamber

from which air is drawn out by the vacuum pump. The

vacuum causes the ﬂ exible diaphragm in the base, and

any materials placed on it, to be pressed against the

glass, thus applying the heat and pressure needed to

bond materials together.

Key Processing Factors:

There are three key processing settings that apply to virtually all

mounting and laminating jobs.

• Temperature

• Time (Dwell)

• Pressure

Temperature: The temperature setting is primarily dictated by the

requirements of the heat-activated adhesives used in the dry mounting

tissue and the overlaminating ﬁ lm recommended for your job. It is

important that the press be operated at the correct temperature to

activate the adhesive and bond the materials. See page 8 for more on

temperature controls.

Time (Dwell): This factor works in conjunction with temperature to create

a permanent bond between materials. Assuming that the temperature

setting of the press is sufﬁ cient to activate the adhesive, it is almost

always preferable to increase dwell rather than temperature. Dwell time

is set using the Timer (page 9) and dictates the vacuum cycle (see

Pressure, below).

Pressure: Pressure is established in the press by the vacuum pump,

which is controlled by the Timer (see page 9). The vacuum presses

the materials together for the amount of time chosen by the operator

using the timer controls. Pressure should usually be set at over 25" of

mercury. It should be reduced for softer mounting materials such as

foam board using the vacuum adjustment valve.

Other Factors

Following the recommended temperature and time settings on your

Glass Top Vacuum Press will almost always produce excellent results.

However, other factors can affect the settings on the machine.

Materials: Manufacturer's dwell and termperature settings are based on

paper graphics. However, heavier materials such as canvas absorb more

heat and may require a higher temperature setting or longer dwell time

setting. This is also true for denser or thicker mounting substrates.

Workpiece size: The same principle applies to the overall size of the

job. Larger jobs absorb more heat and may require longer dwell times.

Illustration 10A: Key processing factors

NOTE:

materials together prior to processing a

challenging or unusual job.

Controls

Whenever possible, test actual