Apparatus for heating preforms made of thermoplastic material

A technology of thermoplastic materials and prefabricated parts, applied in the direction of ohmic resistance heating devices, etc., can solve the problems of reducing equipment efficiency and reducing reflective surfaces

CN110177671AActive Publication Date: 2019-08-27SACMI IMOLA S C IMOLA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-08-27

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Abstract

An apparatus (1) for heating preforms (10) made of thermoplastic material, comprising a conveyance device (2) for preforms (10) having a longitudinal axis of extension (100), intended to move the preforms along a predefined path (200), and heating means (3) arranged along at least one portion of the predefined path (200); the heating means (3) comprise at least one heating element (4) and at leastone front reflective element (5), which are mutually opposite with respect to the predefined path (200) in order to form between them a transit tunnel for the preforms (10); the heating element (4) comprises a plurality of IR (Infra-Red) and / or NIR (Near-Infra- Red) lamps (4a); the front reflective element (5) comprises at least one contoured plate-like body in order to form, in the direction ofextension of the predefined path (200), an alternation of closer portions (6a) and spaced portions (6b) with respect to the predefined path (200) that is extended substantially parallel to the axes ofextension (100) of the preforms (10).
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Description

technical field

[0001] The invention relates to a device for heating preforms made of thermoplastic material. Background technique

[0002] Preforms consist essentially of a tubular body with a closed bottom at a first end and a neck forming an opening at an opposite end: these preforms are usually intended to be manufactured by blow molding said preforms in a mould. Containers, such as plastic bottles.

[0003] Usually, the neck of the preform is separated from the remaining body of the preform by so-called finishing.

[0004] Before feeding the preform into the mould, there is a heating step so that the preform is in an optimum viscosity state during the blowing step in the mold of the blowing unit.

[0005] For this reason, upstream of the blow molding unit there is an oven, usually of tunnel type, designed to heat the preforms so that their bodies have the right temperature.

[0006] Typically, ovens are constructed from a number of modules, each of which is tunnel-sh...

Examples

Embodiment Construction

[0029] With reference to the cited figures, an apparatus for heating preforms made of thermoplastic material according to the invention, generally denoted by reference numeral 1 , comprises means 2 for conveying a preform 10 having an axis 100 of longitudinal extension.

[0030] The conveyor device 2 is designed to move the preforms 10 along a predetermined path 200 .

[0031] Furthermore, the device 1 has heating means 3 arranged along at least a part of the predetermined path.

[0032] The heating tool 3 comprises at least one heating element 4 and at least one front reflective element 5 facing each other with respect to the predetermined path 200 so as to form between them a transport tunnel for the preforms 10 .

[0033] The or each heating element 4 comprises a plurality of IR (infrared) or NIR (near infrared) radiation lamps 4a.

[0034] The heating element 4 conveniently comprises a rear reflective body 4b, the extension of which relative to the predetermined path 200 ...