Back to results
US 2004/0175543 A1Published application
Nonslip thermoplastic part and method for the production thereof
OwnerAlfonso Perez Carballoinventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerAlfonso Perez Carballoinventor
Estimating the term…
A moulded piece of thermoplastic elastomer material, in particular, a homopolymer with polypropylene load and rubber of extremely low hardness, usable as a label, publicity support or similar, with reduced thickness and generally flat, having a smooth face while on the opposite face presents an elevated perimeter border (subdivided or not into individual projections), and on the interior of said border a central surface portion. Lowered with respect to said border, said central portion intended to receive a corresponding ornamentation such as labelling (silkscreen marking, tampography, etc.) or laminar accessory (sticker or similar) without eliminating because of this the non-slipping properties of the piece; and a method for the production of said piece, which consists of a submarine injection moulding, without use of rollers, of cold casting, that allows the piece to be formed preventing the physical properties of the material, especially its highly anisotropic character, from resulting in structural defects that make correct application of the aforementioned surface ornamentation impossible or deteriorate it once applied, comprising the stages of: closing the injection machine press, introducing the thermoplastic material into the spindle device with the desired coloration material, heating the cylinder of the spindle device to produce the fusion of the introduced material, rotating the spindle device at a high rate and a low counter-pressure, leaving the material introduced into the press to cool, opening the press and subsequently the moulds in its interior, and actuating the ejectors, provided with rotary rollers, in combination with impeller means in the base of the imprint to sweep the pieces outside the press, and expelling the cold casting pieces.
- non-slipping piece of thermoplastic elastomer or TPE, usable as a label, publicity support or similar, characterised in that the aforementioned piece (1) consists of a flat body, with an approximately rectangular base, with a bevelled edge (4), body that has a larger smooth face and a smaller opposite face having a perimeter border (2) slightly elevated, of constant thickness, that defines a central surface zone (3) slightly lowered with respect to the upper part of the raised perimeter border (2):
- Non-slipping piece according to claim 1, characterised in that the raised perimeter border (2) is subdivided into a series of independent elevations (2′).
- Non-slipping piece according to claim 2, characterised in that the central surface (3) is at the same level as the base of the elevations (2′).
- Non-slipping piece according to any one of the previous claims, characterised in that thermoplastic elastomer (TPE) material has a hardness between 5 and 30 Shore.
- Non-slipping piece according to claim 1, characterised in that the thermoplastic elastomer (TPE) material has a hardness of 5 Shore.
- Non-slipping piece according to any one of the previous claims, characterised in that the application surface of the piece is of at least 30% with respect to the total surface of the base of the piece.
- Non-slipping piece according to claim 6, characterised in that the application surface of the piece is 35% with respect to the total surface of the base of the piece
- Non-slipping piece according to any one of the previous claims, characterised in that the thickness of the piece is between 1 mm. and 1.5 mm.
- Non-slipping piece according to claim 8, characterised in that the thickness of the piece is 1.4 mm.
- A method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to what is claimed in the previous claims, characterised in that it is carried out by means of submarine injection moulding, without using the roller, and includes the stages of:
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to claim 10, characterised in that each imprint of the mould is filled with 1.5 g of load.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any one of claims 10 to 11, characterised in that the force of closure of the press is 49×104 N.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 12, characterised in that the introduction of material into the feed shoot is carried out at a rate of 25 g of load per cycle.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 13, characterised in that the cylinder is heated to 230° C.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 14, characterised in that the spindle device is made to rotate at a high rate of 300 rpm.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 15, characterised in that the spindle device is made to rotate with a low counter-pressure of 5 bar.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 16, characterised in that the injection rate is 160 cm3/sec.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 17, characterised in that the material introduced in the press is left to cool for 7 seconds.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 18, characterised in that the cooling fluid is water that circulates around the interior of the press with an inlet temperature of 8° C. and an outlet temperature of 14° C.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 19, characterised in that cooling water circulates around the interior of the press at a flow rate of 38 L/hour.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 20, characterised in that it is carried out with cold castings.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 21, characterised in that on opening the press, and as a result the moulds of its interior, some impeller means are actuated, consisting of male mobile pieces that emerge from the bottom of the imprint until exposing the piece beyond the level of the mould.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 22, characterised in that on opening the press, and as a result the moulds of its interior, some ejection means are actuated which incorporate a rotating roller at their end consisting of a cylindrical brush with an axis of revolution parallel to the plate, to “sweep” the pieces until they fall by gravity into the corresponding collection shoot.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 23, characterised in that the total cycle time is 15 seconds.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any one of claims 10 to 25, characterised in that there is an additional stage of incorporating of a double-layer adherent lamina to the smooth surface of the piece produced, and a detachable sheet of coating over said lamina.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to claims 10, 15, 16 or 17, characterised in that the combination of the parameters of rate of rotation of the spindle, the counter-pressure of the spindle and the rate of injection lead to a low mixing level and a high shearing level.
- Method for producing a non-slipping piece of thermoplastic elastomer (TPE), according to any of claims 10 to 25, characterised in that there is an additional stage of incorporating a layer of material adherent to the smooth surface of the produced piece, and a detachable sheet of coating over said lamina.