Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
1 . A process for the manufacture of objects, such as cups, containers or other packaging of crystalline polystyrene characterised in that the process comprises the continuous extrusion of a sheet of crystalline polystyrene through a die having an outlet with an adjustable profile, rolling and stabilisation of the said sheet, heating the edges thereox, drawing the sheet by means of lateral guides to a heating device and a subsequent forming device having a press component, removing the objects so obtained from the press component of the forming device and grinding up the waste.
Claim 2
Dependent Claim
94 words
1 . A process for the manufacture of objects, such as cups, containers or other packaging of crystalline polystyrene characterised in that the process comprises the continuous extrusion of a sheet of crystalline polystyrene through a die having an outlet with an adjustable profile, rolling and stabilisation of the said sheet, heating the edges thereox, drawing the sheet by means of lateral guides to a heating device and a subsequent forming device having a press component, removing the objects so obtained from the press component of the forming device and grinding up the waste.
Claim 3
Dependent Claim
303 words
Apparatus for the manufacture of objects such as cups, containers or other packaging in accordance with the. process of claim 1 , characterised in that the apparatus comprises a screw extruder (8) having a die ( 1 0) with an outlet of adjustable profile, mounted at the end of the screw extruder (9) to produce a continuous sheet of crystalline polystyrene, a roller press ( 12 ) having a plurality of temperature-adjustable rollers (13, 14, 15) and at least one pair of draw rollers ( 1 6, 17) to draw the sheet, at least one of said draw rollers ( 1 6, 17 ) being temperature-adjustable, at least one sheet supporting roller ( 1 9) which is free to rotate about its own axis and is of low thermal conductivity at least on its surface, two switches (35, 36) controlling the build-up of the sheet in the region between the pair of draw rollers ( 1 6, 1 7) and the sheet supporting roller ( 1 9) which can be activated by detection of the position of the sheet by means of mechanical sensors or photocells, a device (20) for heating both edges of the sheet which can be positioned in relation to the breadth of the sheet and adjusted for temperature in relation to the thickness and the distance moved by the advancing sheet, at least one drawing device having chains (22) and sprockets (22', 22") acting on the edges of the sheet, at least one device (24, 25) for heating both sides of the sheet in relation to the part which is to be thermoformed, a'forming device having a press component (29), a device for removing objects from the press component (29), a device (3 1 , 32) for stacking the objects and a device (33) for grinding up the waste.
Claim 4
Dependent Claim
100 words
An apparatus as claimed in claim 2, characterised in that the rate at which the sheet is fed from the die ( 1 0), the speed the temperature and the distance between the temperature-adjustable rollers ( 1 3, 14, 1 5) and the drawing action of the pair of draw rollers ( 1 6, 1 7) are adjusted in such a way that the sheet is of uniform thickness and is sufficiently stabilised in the section between the last of the temperature-adjustable rollers ( 15 ) over which the sheet is fed and the pair of draw rollers (16, 17).
Claim 5
Dependent Claim
49 words
An apparatus as claimed in claim 2 or 3, characterised in that the plane containing the axes of rotation of the pair of draw rollers ( 1 6, 1 7) is at right angles to the direction in which the sheet arrives at the said pair of draw rollers.
Claim 6
Dependent Claim
37 words
An apparatus as claimed in claim 2, 3 or 4, characterised in that the forming device (23) has a plate (27) supporting the press component (29) which is controlled in its alternating movement by a cam device.
Claim 7
Independent Claim
54 words
An apparatus as claimed in any one of claims 2 to 5, characterised in that the forming device has press components (28', 29') which are caused to follow the alternating motion of the corresponding plates (26', 27') and one of the press components (29') is subject to the alternating motion of a ram (37).
Claim 8
Independent Claim
45 words
An apparatus as claimed in any one of claims 2 to 6, characterised in that the minimum (35) and the maximum (36) build-up switches are capable respectively of slowing down and speeding up the rate of output of thermoformed objects without altering their final characteristics.
Claim 9
Independent Claim
48 words
An apparatus as claimed in any one of claims 2 to 7, characterised in that the minimum (35) and the maximum (36) build-up switches are capable respectively of speeding up and slowing down the rate of output of the rolled and stabilised sheet without altering its final characteristics.