JP3050004U - Batch type polyethylene terephthalate crystallization equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel batch type polyethylene terephthalate crystallizing apparatus for converting a pre-crystallized pellet of polyethylene terephthalate into a crystallized pellet so that it can be used for injection molding, blow molding and the like. . SOLUTION: A batch tank 2, an inlet 3 for a coloring masterbatch provided at the upper end of the batch tank 2, an anticoagulant additive such as calcium stearate, and a polyethylene terephthalate pellet before crystallization, Conical screen separator 5 provided in the bottom
And a space 6 formed below the screen separator 5;
An outlet pipe 8 with an opening / closing shutter 7 for discharging crystallized pellets connected to a deep part of the screen separator 5 out of the batch tank 2, and a stirring blade 12 rotating above the screen separator 5 in the batch tank 2. A hot air supply device 17 for supplying hot air into the space 6,
Exhaust port 19 of used hot air provided at the upper part of the batch tank 2
An apparatus comprising:

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a batch-type polyethylene terephthalate crystallization apparatus for converting a pre-crystallized pellet of polyethylene terephthalate into a crystallized pellet so that the pellet can be used for injection molding, blow molding, or the like.

[0002]

[Prior art]

 On the other hand, when polyethylene terephthalate is molded by an injection molding machine, it is necessary to obtain a molded article using crystallized pellets.

[0003] The molded article obtained in this way is also reused.

[0004] For this reuse, the pellets are provided as regenerated pellets, but the regenerated pellets remain in the state before crystallization when they become the above-mentioned molded articles. Injection molding and blow molding cannot be used because they are hardened by a runner, so they had to be recrystallized before being used for molding.

[0005] However, at present, this recrystallization is technically difficult, and is carried out by large-scale processing at a large factory using a large apparatus. For this reason, molding plants that use only a small amount are forced to purchase high-cost recrystallized pellets and perform molding, or give up purchasing and do not perform molding.

[0006]

[Problems to be solved by the invention]

 In view of the above situation, the inventor of the present invention trial-and-errored that a molding plant that only plans to use small quantities could easily re-crystallize itself (of course, crystallize virgin pellets). A polyethylene terephthalate device has recently been provided.

An object of the present invention is to provide a novel batch type polyethylene terephthalate crystallizing apparatus which can easily obtain a small amount of polyethylene terephthalate crystallized pellets by itself.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, a batch type polyethylene terephthalate crystallization apparatus according to the present invention is used to convert a pre-crystallized pellet of polyethylene terephthalate into a crystallized pellet so that it can be used for injection molding, blow molding and the like. Regarding the batch type polyethylene terephthalate crystallization apparatus, the batch tank 2, the masterbatch for coloring provided at the upper end of the batch tank 2, the additive for anticoagulation such as calcium stearate, and the injection port of polyethylene terephthalate pellets before crystallization 3, a conical screen separator 5 provided in the bottom of the batch tank 2, a space 6 formed below the screen separator 5, and crystallized pellets connected to a deep portion of the screen separator 5 in the batch tank 2. Exit with shutter 7 for opening and closing 8, a stirring blade 12 rotating above the screen separator 5 in the batch tank 2, a hot air supply device 17 for supplying hot air into the space 6, and a used device provided in the upper part of the batch tank 2. It has a hot air exhaust port 19.

[0009]

【Example】

 In the embodiment shown in the figure, a conical-bottom cylindrical cylinder 2 whose entire outer peripheral surface is covered with a heat insulating material 1 is formed, and a master pellet batch for coloring and a calcium stearate are placed on the top wall of the batch tank 2. An inlet 3 for an additive for preventing coagulation and pellets of polyethylene terephthalate before crystallization is provided, and a conical screen separator 5 slightly shallower than the bottom 4 is provided inside the conical bottom 4 of the batch tank 2. A conical space 6 is formed between the conical bottom 4 and the screen separator 5, and a discharge port tube 8 with a shutter 7 for opening and closing the crystallized pellets at the lower end of the screen separator 5. From the outlet tube 8 and the crystallized pellets mixed with the masterbatch for coloring (hereinafter simply referred to as crystallized pellets). ) To a molding machine (not shown), and a rotating shaft 10 rotated by a stirring motor (not shown) at the center of the top wall of the batch tank 2. The crystallization pellets (hereinafter, simply referred to as crystallization pellets) mixed with the masterbatch for coloring existing in the batch tank 2 and the screen separator 5 are located above the rotating shaft 10. A control panel for supplying hot air by heating by bringing external air sucked in by a blower 14 into contact with a built-in heater 15 near the side of the batch tank 2 and stirring the blades 12 A hot air supply device 17 with a hot air supply 16 is provided, and a hot air supply port 18 of the hot air supply device 17 is opened in an outer wall of the conical space 6 and the batch air supply device 17 is opened. Exhaust port 19 of the obsolete hot air hot air on the top wall of the click 2 (be with full Iruta is also possible.) In which the provided.

In the drawings, reference numeral 21 denotes a lid for inspection, 22 denotes a dust outlet, and 23 denotes a pellet gauge window.

In the above-described embodiment, first, the blower 14 is rotated, and at the same time, the built-in heater 15 is energized to preheat the whole and the stirring blades 12 are rotated, and then the polyethylene terephthalate is crystallized through the inlet 3 before the crystallization. The pellets, coloring masterbatch, and calcium stearate are charged up to the respective amounts, and the temperature is controlled by the control panel 16 of the hot air supply device 17 until a certain period of time based on data obtained in advance to obtain a stable temperature state. Subsequently, when the completion of crystallization of the pellet before crystallization is confirmed in the pellet gauge window 23 (when the color changes from transparent to white), the supply and stirring of the hot air are stopped, and after the stop, the shutter 7 is opened to perform coloring. The mastered batch mixed with crystallized pellets is supplied directly to the molding machine from the outlet pipe 8 or packed into a bag after stocking. It is used in usages such as

In the above-mentioned usage, when the shutter 7 is opened and the crystallized pellets are taken out, it is convenient to prevent solidification in the next use if it is left at the bottom of the screen separator 5 without taking out all of them. In addition, the above-described embodiment can be used without supplying the pelletized masterbatch for coloring, and especially when the pelletized masterbatch for coloring is supplied as in the above-described embodiment, the mixing is averaged. Therefore, it is not necessary to use a tumbler in advance, which is effective for improving the efficiency and avoiding the danger that the crystallization is melted when the tumbler is mixed later.

[0013]

[Effect of the invention]

 Since the batch type polyethylene terephthalate crystallization apparatus according to the present invention is as described above, the polyethylene terephthalate pellets before crystallization (regenerated pellets, etc.), the coloring masterbatch, and calcium stearate are injected up to the respective amounts and heated. During the stirring while feeding, the pellets can be crystallized one by one without causing the whole to crystallize instantaneously and harden in the tank and become immobile. It has a remarkable effect that can completely achieve the intended purpose.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation material 2 Batch tank 3 Input port 4 Conical bottom 5 Screen separator 6 Space 7 Opening / closing shutter 8 Discharge pipe 10 Rotating shaft 11 Bottom port 12 Stirrer blade 14 Blower 15 Heater 16 Control panel 17 Hot air supply device 18 Hot air supply port 19 Exhaust port 21 Inspection lid 22 Garbage outlet 23 Pellet gauge window

Claims (1)

[Utility model registration claims] 1. A batch type polyethylene terephthalate crystallization apparatus for converting a pre-crystallized polyethylene terephthalate pellet into a crystallized pellet so that it can be used for injection molding, blow molding or the like. A charging masterbatch provided at the upper end of the injection port 3 for an additive for preventing coagulation such as calcium stearate and a pellet before crystallization of polyethylene terephthalate; a conical screen separator 5 provided in the bottom of the batch tank 2; A space 6 formed under the screen separator 5, a discharge pipe 8 with an opening / closing shutter 7 for opening crystallized pellets connected to a deep portion of the screen separator 5 out of the batch tank 2, and Stirring blade rotating inside the screen separator 5 A batch type polyethylene terephthalate crystal, comprising: a root 12; a hot air supply device 17 for supplying hot air into the space 6; and a used hot air exhaust port 19 provided at an upper portion of the batch tank 2. Device.