US3668288A — Method for making thermoplastic synthetic resin h…

Claim 1

Independent Claim 219 words

A method of making a substantially stress-free thermoplastic synthetic resin hollow structure article having a predetermined cross-sectional configuration, comprising: a. heating thermoplastic synthetic resin at least to its melting point; b. extruding said thermoplastic synthetic resin by means of at least one extruder device and shaping the same into a continuous hollow structure; c. forcing coolant fluid to contact the outer surface of said shaped hollow structure while it is still at a high temperature and in a deformable state d. withdrawing said coolant fluid from contact with said outer surface and, thereby adjusting the contact time and amount of said fluid in contact with said outer surface to control the intensity of cooling thereof and quickly cool said outer surface to a solidified and non-tacky state while substantially avoiding retention of residual internal stress due to rapid solidification and shrinkage of the hollow structure; e. causing the solidified and non-tacky outer surface of said hollow structure to contact the inner surface of an externally disposed suction mechanism so as to control the outer dimensions of said hollow structure and impart said predetermined cross-sectional configuration thereto by means of said inner surface of said suction mechanism while slowly cooling said hollow structure by an externally disposed cooling mechanism through the inner surface thereof and maintaining said predetermined cross-sectional configuration.

Claim 2

Independent Claim 219 words

A method of making a substantially stress-free thermoplastic synthetic resin hollow structure article having a predetermined cross-sectional configuration, comprising: a. heating thermoplastic synthetic resin at least to its melting point; b. extruding said thermoplastic synthetic resin by means of at least one extruder device and shaping the same into a continuous hollow structure; c. forcing coolant fluid to contact the outer surface of said shaped hollow structure while it is still at a high temperature and in a deformable state d. withdrawing said coolant fluid from contact with said outer surface and, thereby adjusting the contact time and amount of said fluid in contact with said outer surface to control the intensity of cooling thereof and quickly cool said outer surface to a solidified and non-tacky state while substantially avoiding retention of residual internal stress due to rapid solidification and shrinkage of the hollow structure; e. causing the solidified and non-tacky outer surface of said hollow structure to contact the inner surface of an externally disposed suction mechanism so as to control the outer dimensions of said hollow structure and impart said predetermined cross-sectional configuration thereto by means of said inner surface of said suction mechanism while slowly cooling said hollow structure by an externally disposed cooling mechanism through the inner surface thereof and maintaining said predetermined cross-sectional configuration.

Claim 3

Dependent Claim 60 words

A method as defined in claim 1 wherein when the molten thermoplastic synthetic resin hollow structure heated and extruded in an integral form from said extruder device is cooled and shaped by applying coolant fluid onto the outer surface thereof, any portion of said coolant which would flow back toward the extruder device is sucked and removed by exclusion means.

Claim 4

Dependent Claim 73 words

A method as defined in claim 1, wherein when the molten thermoplastic synthetic resin hollow structure extruded from said extruder device is cooled and shaped by applying the coolant fluid onto the outer surface thereof, the temperature of said coolant fluid is raised to reduce the temperature difference between the coolant fluid and the hollow structure to be cooled and thereby reduce the cooling of the hollow structure effected by said coolant fluid.

Claim 5

Dependent Claim 29 words

A method as defined in claim 1, wherein the application of the coolant fluid is carried out by showering the coolant fluid onto the outer surface of the structure.

Claim 6

Dependent Claim 64 words

A method as defined in claim 1, wherein said extruded hollow structure of thermoplastic synthetic resin is cooled and shaped by introducing compressed air into the hollow portion of said hollow structure in order to prevent the deformation of said structure as well as to promote good contact between the outer surface of the hollow structure and said inner surface of said suction mechanism.

Claim 7

Dependent Claim 29 words

A method as defined in claim 1, wherein opening means of said suction mechanism suck the coolant fluid whereby the sizing device also serves as a suitable take-off device.

Claim 8

Dependent Claim 82 words

A method of making thermoplastic synthetic resin hollow structure as defined in claim 1, wherein said suction mechanism for controlling the outer dimensions of said hollow structure is used to withdraw said coolant fluid from said outer surface, the suction action of each row of several rows of openings in said suction mechanism being started and stopped separately, and contact of coolant fluid with said outer surface of the hollow structure thereby being started and stopped separately in each of said rows.

Claim 9

Dependent Claim 39 words

A method as defined in claim 7, wherein the length of time for cooling the hollow structure by means of the coolant fluid is adjusted by selecting, in said suction mechanism, a suitable number of rows of said openings.

Claim 10

Dependent Claim 33 words

A method as claimed in claim 1, further comprising heating said Thus cooled solid hollow structure to completely eliminate any residual internal stress therein and to increase the crystallization of the resins thereof.

Claim 11

Dependent Claim 26 words

A method as defined in claim 9, wherein said hollow structure is heated at least to the specific annealing temperature of the resin of said structure.

Claim 12

Dependent Claim 53 words

A method as defined in claim 9, wherein said heating is carried out in such a manner that the hollow structure is annealed in the heating device without being subjected to any tension because of a provision of drawing devices between the sizing device and the heating device and behind the heating device.

Claim 13

Independent Claim 271 words

A method of making a substantially stress-free thermoplastic synthetic resin hollow structure article having a predetermined cross-sectional configuration comprising: a heating thermoplastic synthetic resin at least to its melting point; b. extruding said thermoplastic synthetic resin and forming it into an extruded continuous hollow structure of a predetermined cross-sectional configuration; c. contacting coolant fluid with upper and lower surfaces of said extruded continuous hollow structure of a predetermined cross-sectional configuration by means of at least one pair of suitable coolant applying devices while said hollow structure is still deformable; d. removing, at a suitable interval thereafter, said coolant fluid from said outer surfaces by means of a pair of take-off devices having suction force to thereby interrupt the cooling of the hollow structure effected by said coolant fluid, thereby quickly cooling said outer surface to a a solidified and non-tacky state while substantially avoiding retention of residual internal stress due to rapid solidification and shrinkage of the hollow structure; e. imparting suction force to the inner surface of a suction mechanism in at least one set of opposed metallic sizing devices so as to contact the solidified and non-tacky upper and lower surfaces of the hollow structure with the corresponding inner surface of said sizing devices to thereby control the outer thickness of said hollow board structure by means of the distance between the inner surface of said opposed sizing devices while slowly cooling the hollow structure due to the contact between the metallic inner surface of said sizing devices and the solidified outer surface of the hollow board structure thereby sizing said hollow board structure into a predetermined cross-sectional configuration.

Claim 14

Independent Claim 271 words

A method of making a substantially stress-free thermoplastic synthetic resin hollow structure article having a predetermined cross-sectional configuration comprising: a heating thermoplastic synthetic resin at least to its melting point; b. extruding said thermoplastic synthetic resin and forming it into an extruded continuous hollow structure of a predetermined cross-sectional configuration; c. contacting coolant fluid with upper and lower surfaces of said extruded continuous hollow structure of a predetermined cross-sectional configuration by means of at least one pair of suitable coolant applying devices while said hollow structure is still deformable; d. removing, at a suitable interval thereafter, said coolant fluid from said outer surfaces by means of a pair of take-off devices having suction force to thereby interrupt the cooling of the hollow structure effected by said coolant fluid, thereby quickly cooling said outer surface to a a solidified and non-tacky state while substantially avoiding retention of residual internal stress due to rapid solidification and shrinkage of the hollow structure; e. imparting suction force to the inner surface of a suction mechanism in at least one set of opposed metallic sizing devices so as to contact the solidified and non-tacky upper and lower surfaces of the hollow structure with the corresponding inner surface of said sizing devices to thereby control the outer thickness of said hollow board structure by means of the distance between the inner surface of said opposed sizing devices while slowly cooling the hollow structure due to the contact between the metallic inner surface of said sizing devices and the solidified outer surface of the hollow board structure thereby sizing said hollow board structure into a predetermined cross-sectional configuration.

Claim 15

Dependent Claim 30 words

A method of making thermoplastic synthetic resin hollow structure articles as defined in claim 12, further comprising filling the hollow portion of the hollow structure with foamable thermoplastic synthetic resin.

Claim 16

Dependent Claim 56 words

A method as defined in claim 12, wherein when the molten thermoplastic synthetic resin hollow structure heated and extruded in an integral form is cooled and shaped by applying coolant fluid onto the outer surface thereof, any portion of said coolant which would flow back toward the die devices is sucked and removed by exclusion means.

Claim 17

Dependent Claim 68 words

A method as defined in claim 12, wherein when the molten thermoplastic synthetic resin hollow structure is cooled and shaped by applying said coolant fluid onto the outer surface thereof, the temperature of said coolant fluid is raised to reduce the temperature difference between the coolant fluid and the hollow structure to be cooled and thereby reduce the cooling of the hollow structure effected by said coolant fluid.

Claim 18

Dependent Claim 30 words

A method as defined in claim 12, wherein the application of the coolant fluid is carried out by showering the coolant fluid out to the outer surface of the structure.

Claim 19

Dependent Claim 29 words

A method as defined in claim 12, wherein the application of the coolant fluid is carried out by rolling the coolant fluid onto the outer surface of the structure.

Claim 20

Dependent Claim 27 words

A method as defined in claim 12, wherein the application of the coolant fluid is carried out by permeation of the coolant fluid through said sizing device.

Claim 21

Dependent Claim 29 words

A method as defined in claim 12, wherein opening mEans of said sizing device suck the coolant fluid whereby the sizing device also serves as a suitable take-off device.

Claim 22

Dependent Claim 81 words

A method of making thermoplastic synthetic resin hollow structure as defined in claim 12, wherein said sizing device for controlling the outer dimensions of said hollow structure is used to remove said coolant fluid from said outer surface suction action of each row of several rows of openings in said sizing device being started and stopped separately, and contact of coolant fluid with said outer surface of the hollow structure thereby being started and stopped separately in each of said rows.

Claim 23

Dependent Claim 50 words

A method as claimed in claim 12, further comprising re-heating said hollow board structure after said sizing by means of one or more sets of opposed heating means so as to completely eliminate any residual internal stress remaining therein and so as to increase the crystallization of the structure resin.

Claim 24

Dependent Claim 34 words

A method as defined in claim 21, wherein said re-heating is carried out by imparting thermal energy to the outer surface of said hollow structure by the use of a contact heat transmission system.

Claim 25

Dependent Claim 33 words

A method as defined in claim 21, wherein said re-heating is carried out by imparting thermal energy to the outlet surface of said hollow structure by use of a non-contact heat radiation system.

Claim 26

Dependent Claim 53 words

A method as defined in claim 21, wherein said re-heating is carried out in such a manner that the hollow structure is annealed in the heating device without being subjected to any tension because of the provision of drawing devices between the sizing device and the heating device and behind the heating device.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-06-06	1975-12-06	1976-06-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-06-06	1979-12-06	1980-06-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-06-06	1983-12-06	1984-06-06	$7700.00	Window Closed / Lapsed

Method for making thermoplastic synthetic resin hollow structure articles

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