During the injection process, this double barrel can concurrently inject two types of molten plastic, via the same nozzle, into the mold to achieve double material simultaneous injection. The outer layer of the mixed molten plastic is called the skin material, while the inner layer is called the core material.

Sandwich molding has the following advantages over traditional injection molding:

• For products with different outer and inner-layer material, traditional two-step insert molding becomes one-step.
• The different color combinations give old products (molds) new life.
• Low viscous materials can be used as core materials to reduce injection pressure.
• Recycled and low-quality materials can be used as core materials to increase product utility.
• High-quality materials with anti-magnetic interference properties and high surface quality can be used as skin materials to increase product utility.
• Appropriate core and skin material combinations can reduce the residual stress and increase product hardness.
• Sandwich injection molding machine are able to produced single color which provides a multifunction and flexible molding method. This increases the processor's capability to produce high-quality and low-cost products.

Our sandwich injection molding machine packs several powerful features:

1. There are two sets of proportional control valves which can simultaneously control the pressure and speed of both sets.
2. With an accuracy reaching 0.01mm, linear potentiometers are used in the two injection sets and clamping molds to accurately control the injection process and the opening and closing of mold.
3. With features such as limitations for screw cold starts, broken wire detection, etc., a PID temperature controller is used to control the temperature at ±1°C.
4. The microprocessor control system not only has memory functions, it can also perform 4-stage injection, 3-stage hold pressure, and 3-stage back pressure.

Item	Unit	FB-110C		FB-140C		FB-180C		FB-220C
Skin Material (A) and Core Material (B)		A	B	A	B	A	B	A	B
Injection Unit
Screw Diameter	mm	30	28	32	30	34	32	40	40
Injection Pressure	kg/cm²	1732	1988	1522	1732	1350	1522	1618	1618
Theoretical Shot Volume	cm³	92	80	105	92	118	105	200	200
Shot Weight of Injection (PS)	grams	85	74	96	85	108	96	186	186
Injection Rate	cm³/sec	61	53	85	61	96	85	97	97
Plasticizing Capacity (PS)	kg/hr	33	29	35	33	37	33	44	44
Screw Rotation Speed	rpm	240	240	240	240	240	240	155	155
Clamping Unit
Clamping Force	metric tons	110		140		180		220
Clamping Strokes	mm	350		380		420		450
Dry Run Cycle	sec	1.8		1.8		1.8		2
Suggested Min Mold Dim (HxV)	mm	255 x 220		275 x 240		300 x 275		340 x 300
Mold Thickness	mm	110 - 440		110 - 500		120 - 560		200 - 650
Distance Between Tie Bars (HxV)	mm	390 x 340		420 x 370		460 x 420		520 x 460
Mold Platen (HxV)	mm	590 x 540		650 x 600		725 x 685		800 x 740
Ejectior Stroke	mm	90		100		125		145
Electrical Equipment
Pump Driving Motor	HP (kw)	30 (22.38)		30 (22.38)		30 (22.38)		40 (29.84)
Temperature Controller	(range) set	(0-400°C)x6		(0-400°C)x6		(0-400°C)x6		(0-400°C)x8
Heater Capacity	kw	7.0		8		8		16
Others
Machine Dimensions (LxWxH)	mm	4900 x 1100 x 1800		5400 x 1250 x 1924		6000 x 1300 x 2250		6250 x 1400 x 2320
Oil Tank Capacity	liter	230		260		300		500
Machine Weight	meteric tons	4.5		6		7.5		11
Pump Pressure	kg/cm²	140		140		140		140

*The shot weight is based on polystyrene at specific gravity of 1.05.
*Due to continuous improvements, we reserve the right to amend the above specifications without prior notice.