摘要:
Equipment for manufacturing a polyethylene terephthalate container which is capable of withstanding, without appreciable deformation, relatively severe thermal conditions encountered during processing by filling with a hot liquid or pasteurization of the contents of the container. The equipment includes a first mold which is designed to shape the body of an intermediate container from the body of an amorphous polyethylene terephthalate preform to a size larger than the dimensions of the final container to be obtained. Second, the equipment includes a treatment station which itself includes a first heating device which simultaneously heats the body and neck section of the intermediate container to a temperature of about 160.degree. to about 240.degree. C. to rapidly shrink the body of the intermediate container and to effect crystallization of the neck section and increase the crystallinity of the contracted intermediate container body. The treatment station then slowly cools the neck section while heating of the contracted intermediate container body continues. The heated intermediate container is placed in a second mold which has dimensions corresponding to the final size of the container to be obtained.
摘要:
Equipment for manufacturing a polyethylene terephthalate container which is capable of withstanding, without appreciable deformation, relatively severe thermal conditions encountered during processing by filling with a hot liquid or pasteurization of the contents of the container. The equipment includes a first mold which is designed to shape the body of an intermediate container from the body of an amorphous polyethylene terephthalate preform to a size larger than the dimensions of the final container to be obtained. Second, the equipment includes a treatment station which itself includes a first heating device which first heats only the body section of the intermediate container to a temperature of about 160.degree. to about 240.degree. C. to rapidly shrink the body of the intermediate container and then heats the neck section while the contracted intermediate body continues to be heated to effect crystallization of the neck section and increase the crystallinity of the contracted intermediate container body. The treatment station then slowly cools the neck section while heating of the contracted intermediate container body continues. The heated intermediate container is placed in a second mold which has dimensions corresponding to the final size of the container to be obtained.
摘要:
Equipment for manufacturing a polyethylene terephthalate container which is capable of withstanding, without appreciable deformation, relatively severe thermal conditions encountered during processing by filling with a hot liquid or pasteurization of the contents of the container. The equipment includes a first mold which is designed to shape the body of an intermediate container from the body of an amorphous polyethylene terephthalate preform to a size larger than the dimensions of the final container to be obtained. Second, the equipment includes a treatment station which itself includes a first heating device which simultaneously heats the body and neck section of the intermediate container to a temperature of about 160.degree. to about 240.degree. C. to rapidly shrink the body of the intermediate container and to effect crystallization of the neck section and increase the crystallinity of the contracted intermediate container body. The treatment station then slowly cools the contracted intermediate container body and the neck section, whereafter a second heating device heats the contracted intermediate container prior to placing it in a second mold. The second mold has dimensions corresponding to the final size of the container to be obtained.
摘要:
A process for the manufacture of a polyethylene terephthalate (PET) container capable of withstanding, without appreciable deformation, relatively severe thermal conditions encountered during processing by filling with a hot liquid or pasteurization of the contents of the container. The process inlcudes the following steps, on an amorphous PET preform which includes a body and a neck section which already possesses the final shape and dimensions of the PET container to be formed, heating only the body, exclusive of the neck section, of the PET preform to a temperature at least equal to the PET-softening temperature; in a mold, blow molding the heated preform body to form an intermediate container whose body has dimensions greater, by about 20% with respect to height and by 0 to about 30% transversely, than the dimensions of the PET container to be formed, while cooling the mold walls holding the intermediate container to a temperature of about 5.degree. to about 40.degree. C.; heating the body of the intermediate container to a temperature of about 160.degree. to about 240.degree. C. for a period of about 1 to about 5 minutes to obtain an intermediate container with contracted body, while heating the neck section during part of or the entire body heating time under temperature and time conditions sufficient to allow crystallization of the PET neck section alone; slowly cooling the neck section; and blow molding the heated contracted body of the intermediate container obtained to its final shape and dimensions for a period of about 2 to about 6 seconds.
摘要:
A process for the manufacture of a polyethylene terephthalate (PET) container from a hollow amorphous PET preform which includes an open end and a closed end, the open end forming a neck section having dimensions already conformed to its final size and shape, the container being able to withstand relatively severe thermal conditions encountered when the container is filled with a hot liquid, without appreciable deformation, including the steps of: a) rapidly heating only the body of the PET preform, exclusive of the neck section, to a temperature at which subsequent longitudinal and transverse stretching cause no stresses in the PET; b) transferring the hot preform from step (a) to a mold whose walls are maintained at a temperature lower than the temperature of the hot preform body; c) longitudinally stretching the preform body while simultaneously transversely expanding it by blow-molding using a pressurized fluid so as to mold the preform body to the shape of the mold cavity; d) rapidly evacuating the pressurized fluid from the molded container of step (c); and e) removing the container from the mold.
摘要:
Equipment for manufacturing a polyethylene terephthalate container which is capable of withstanding, without appreciable deformation, relatively severe thermal conditions. The equipment includes a first mold which is designed to shape the body of an intermediate container from the body of an amorphous polyethylene terephthalate preform to a size larger than the dimensions of the final container to be obtained. Second, the equipment includes a treatment station which itself includes a first heating device which, in one embodiment, first heats only the body section of the intermediate container to a temperature of about 160.degree. to about 240.degree. C. to rapidly shrink the body of the intermediate container and then heats the neck section while the contracted intermediate body continues to be heated to effect crystallization of the neck section and increase the crystallinity of the contracted intermediate container body. In a second embodiment, the neck and body sections are heated simultaneously. The treatment station then slowly cools the neck section while heating of the contracted intermediate container body continues. The heated intermediate container is placed in a second mold which has dimensions corresponding to the final size of the container to be obtained. In a third embodiment, after simultaneous heating of the neck and body sections in the treatment station, the neck section and the contracted intermediate container body are slowly cooled, then the contracted container body is heated with a second heating device prior to placing it in the second mold.
摘要:
Blow molding processes for the manufacture of polyethylene terephthalate (PET) containers are disclosed. The containers are capable of withstanding, without appreciable deformation, relatively severe thermal conditions encountered during processing by filling with a hot liquid or pasteurization of the contents of the container. A representative process includes the steps of blow molding the heated body of an amorphous PET preform comprising a body and a neck section having a body with dimensions greater than the dimensions of the final PET container to be formed; heating only the body of the intermediate container under specified conditions to rapidly shrink the body, thus forming a contracted body; heating the neck section to effect crystallization thereof; slowly cooling the neck section alone while heating of the contracted intermediate body continues; and blow molding the heated contracted body of the intermediate container in a second mold to its final shape and dimensions.
摘要:
The invention concerns a container comprising a body formed by walls and a bottom having in his greater section a dimension d1 and a neck with an internal diameter d2, said container being made from a semi-crystalline PET, the body of said container comprising at its bottom at least three feet spaced from each other and being integral with said body, wherein for the body, the ratio weight of the walls on weight of the bottom is comprised between 3 and 4 and wherein the ratio volume of the body of the container per gram of PET of the body is comprised between 80 and 120.
摘要:
The present invention relates to a process for manufacturing a preform from a semicrystalline amorphous polymer at a slow rate of crystallization, in which: the said polymer is plasticized at (3) by rapidly raising its temperature to a temperature below the melting point; the said plasticized polymer is pressed through a die (4); on leaving the die, the said polymer is swept by a hot dry inert gas (11); the plasticized polymer is received in a first container (6), while keeping the polymer at the same temperature as the plasticizing temperature in all the steps; and a die pressing step (13) is carried out in the said first container or in a second container, transferred from the first, with sudden cooling so as to obtain the preform in an amorphous state.
摘要:
Method of producing a polyester resin container, such as a PET bottle, from a preform (10) includes a step whereby the preform (10) is heated to a temperature above a glass-transition temperature and a drawing step which is performed in a cavity (101). According to the invention, during the drawing step, an incompressible fluid and not a gaseous fluid is injected through the opening in the preform (10′).