Rockstock - Biodegradable paper made from stone.

Food trays

foodtrays_499_339_100

Rocktherm Lo Res Logo

A Thermoforming range of boards for the food industry

Suitable for the freezer or chiller and hot food.

A 4 micron layer of PE both sides of the calcium carbonate RPD enables a safer surface for food with

no reaction to acidic foods.

[STN / SFN] INFORMATION SHEETLast Updated: 07-07-2010

A. TYPES OF STN & ITS APPLICATIONS

STN (1.6)
THICKNESS (m)		DENSITY		GSM	M2 / TON	APPLICATIONS (THERMOFORMING/PRINTING)
400		1.6		640	1563	Soap Tray, Mobile Phone Tray, Chocolate Liner
500		1.6		800	1250	Lunch Box, Fruit Box, Yogurt Wrapping Box, Tags
600		1.6		960	1042	Yogurt Tubs, Cookie container
700		1.6		1120	893	Ice-cream Tubs, Fish Mat, Meat Mat
N.B: Surface of STN (1.6) is flat. We have not come across any converter who has had any problems forming STN (1.6). Thickness Variation Average ±10micro
SFN (1.4)
THICKNESS (m)	DENSITY		GSM		M2 / TON	APPLICATIONS (THERMOFORMING ONLY)
400	1.4		560		1786	Soap Tray, Mobile Phone Tray, Chocolate Liner,
500	1.4		700		1429	Lunch Box, Fruit Box, Yogurt Wrapping Box
600	1.4		840		1190	Yogurt Tubs, Cookie container,
700	1.4		980		1020	Ice-cream Tubs, Fish Mat, Meat Mat
N.B: Surface of STN (1.4) is not fully flat, instead has a special texture feel. Most converters should be able to thermoform with this grade. More care seems to be required for thermoforming the STN (1.4) as compared to STN (1.6). Thickness Variation Average ±10%.

B. TEST REPORTS:

1. RoHS

2. FDA

3. FOOD APPLICATION (underway)

C. TIPS

1. It is okay to keep heated food in the containers, though we do not recommend using this material

in microwaves or ovens. In contrast, you will find using our STN in cold and wet environments is extremely suitable!

D. ROLL WIDTH / LENGTH

WIDTH: 1200mm (still in progress to check if wider widths can be provided)

LENGTH:

THICKNESS (MICRON)	LENGTH (METER)
400	1500
500	1200
600	1000
700	900

E. SURFACE TREATMENT

STC/STO: The surface of STN is PE lamination. Thus should one require printing on this (rotary) then corona treatment needs to be done. Printing on the 1.6 density series is more recommended over the 1.4density as the 1.6 density has a flatter surface.
STN: On the contrary, should heat sealing be required then corona treatment should not be done.

N.B. Where there is to be heat seal, corona surface treatment is not recommended.

reel stock, sheets or Finished product ( trays and moulded containers, clamshells , egg cartons etc.) can be purchased from the Stone Paper Company to your own design or from a wide range of standing shapes and sizes.

Apart from supplying the material we can also provide finished product from

a wide range of moulds and dies available.

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