A preform heating mechanism with handle

Abstract

A preform heating mechanism with a handle is provided. The heating area is divided into a low-temperature heating area and a normal heating area by a first handle protection plate and a second handle protection plate. The power of the heating lamps in the low-temperature heating area and the power of the heating lamps in the normal heating area can be adjusted to control the radiation energy and temperature of the heating lamps in each area to the plastic preform. At the same time, due to the first handle protection plate and the second handle protection plate, the direct heat radiation light of the heating lamps in the low-temperature heating area and the normal heating area can be blocked, and the oblique heat radiation light of the heating lamps in the low-temperature heating area and the normal heating area can be partially blocked to achieve low-temperature heating of the handle part of the plastic preform and normal heating of the preform body below the handle. Since the low-temperature heating of the handle part can be achieved, the problem of the handle of the plastic preform made of PET material with a handle becoming soft and deformed due to heating is avoided, and the quality of bottle blowing is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of bottle blowing processing equipment, in particular to a preform heating mechanism for a bottle with a handle. Background Art

[0002] At present, plastic bottles with handles on the market (especially plastic milk bottles) are roughly divided into HDPE plastic bottles with built-in handles after one-piece molding and PET plastic bottles with rear handles installed at the back. Both types of plastic bottles have problems. There are three problems with HDPE plastic bottles: First, HDPE plastic bottles can only be formed by extrusion blow molding (process flow: PE resin raw material → sol → parison extrusion → mold closing → blowing → pressure holding → cooling → mold opening → product removal (subsequent trimming) and other processes) due to the material's molding properties. The mold structure is complex and expensive. The cost of a single set of molds is more than twice that of PET material molds, and the output is low. Second, HDPE plastic bottles are not strong enough and are easily damaged. During transportation and storage, additional turnover boxes need to be added to place these HDPE plastic bottles, which not only increases the manufacturer's transportation costs, but also requires more storage space. Third, there is a lot of waste and the product needs to be trimmed later. Fourth, more resin is used, which is 30% of the same specification of PET resin. Fifth, HDPE material has poor oxygen barrier properties, and milk contained in it is easily oxidized and deteriorated. As for PET plastic bottles, the injection stretch blow molding (process flow: PET resin raw material → drying → melt → high pressure injection molding → pressure holding → cooling → mold opening → embryo removal → tube temperature adjustment → mold closing → stretch blow molding → pressure holding → cooling → mold opening → product removal) can well solve the problems of the above-mentioned HDPE plastic bottles, and has the advantages of good sealing, strong bottle, high oxygen barrier performance and transparent and easy to observe. However, the handle of the PET plastic bottle currently needs to be produced and installed on the plastic bottle through specific equipment, so this also requires additional production costs. In summary, the technical personnel in this industry consider replacing the HDPE plastic bottle with a handle with a PET plastic bottle with a handle. However, the handle of the PET plastic bottle with a handle does not participate in the blowing process during the blowing process. Therefore, during the heating process, the handle part of the plastic bottle must be technically processed to prevent the handle part from softening and deforming due to the high temperature during the blowing process, thereby causing the PET plastic bottle with a handle to fail. Summary of the invention

[0003] The present invention aims to provide a heating mechanism capable of preventing a handle of a plastic bottle preform made of PET material with a handle from becoming soft and deformed due to high temperature during a bottle blowing process.

[0004] The present invention discloses a preform heating mechanism with a handle, comprising a heating box provided with a heating lamp tube and a heat insulation plate provided at the bottom of the heating box, a reflective plate mounting frame opposite to the heating box is provided on the heat insulation plate, an external cooling water channel is provided on the top of the heating box, and an internal cooling water channel is provided on the top of the reflective plate mounting frame, a spacing is provided between the external cooling water channel and the internal cooling water channel for allowing the bottle mouth of the plastic bottle preform to pass through, the heating box, the heat insulation plate, the reflective plate mounting frame, the external cooling water channel and the internal cooling water channel form a heating area for heating the bottle body of the plastic bottle preform; a first handle protection plate is provided on the reflective plate mounting frame, and a second handle protection plate is provided on the heating box, the first handle protection plate is opposite to the second handle protection plate and a spacing is provided between the two for allowing the bottle body of the plastic bottle preform to pass through, the first handle protection plate and the second handle protection plate divide the heating area into a low-temperature heating area and a normal heating area, the low-temperature heating area is opposite to the handle portion of the plastic bottle preform, and the normal heating area is opposite to the body portion of the plastic bottle preform below the handle.

[0005] The present invention discloses a heating mechanism for a preform with a handle. Since a plurality of heating lamps are arranged on the side wall of the heating box from top to bottom, and the heating area is divided into a low-temperature heating area and a common heating area by a first handle protection plate and a second handle protection plate, the low-temperature heating area is opposite to the handle of the plastic preform, and the common heating area is opposite to the preform body below the handle of the plastic preform, the power of the heating lamps in the low-temperature heating area and the power of the heating lamps in the common heating area can be adjusted to control the radiation energy and temperature of the heating lamps in the respective areas to the plastic preform. At the same time, since the first handle protection plate and the second handle protection plate are provided, the direct heat radiation light of the heating lamps in the low-temperature heating area and the common heating area can be blocked, and the oblique heat radiation light of the heating lamps in the low-temperature heating area and the common heating area can be partially blocked, so as to realize low-temperature heating of the handle part of the plastic preform and common heating of the preform body below the handle (common heating is normal heating with a temperature higher than that of the low-temperature heating area). Since the handle can be heated at low temperature, the problem of the handle of the PET plastic bottle embryo with a built-in handle becoming soft and deformed due to heating is avoided, thereby ensuring the quality of the bottle blowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the structure of the present invention.

[0007] Figure 2 for Figure 1 Screenshot in the middle AA direction.

[0008] Figure 3 It is a schematic diagram of the structure of the first handle protection plate and the second handle protection plate. DETAILED DESCRIPTION

[0009] A preform heating mechanism with a handle, such as Figure 1 and Figure 2 As shown, it comprises a heating box 1 provided with a heating lamp tube and a heat insulation board 2 provided at the bottom of the heating box 1, a reflector mounting frame 6 opposite to the heating box 1 is provided on the heat insulation board 2, an external cooling water channel 4 is provided on the top of the heating box 1, and an internal cooling water channel 5 is provided on the top of the reflector mounting frame 6, and there is a spacing between the external cooling water channel 4 and the internal cooling water channel 5 for the bottle mouth of the plastic bottle preform to pass through, and the heating box 1, the heat insulation board 2, the reflector mounting frame 6, the external cooling water channel 4 and the internal cooling water channel 5 form a bottle body heating space for the plastic bottle preform. A hot heating area; a first handle protection plate 8 is arranged on the reflector mounting frame 6, and a second handle protection plate 3 is arranged on the heating box 1. The first handle protection plate 8 is opposite to the second handle protection plate 3 and there is a gap between the first handle protection plate 8 and the second handle protection plate 3 for the bottle body of the plastic bottle preform to pass through. The first handle protection plate 8 and the second handle protection plate 3 divide the heating area into a low-temperature heating area and a normal heating area. The low-temperature heating area is opposite to the handle part of the plastic bottle preform, and the normal heating area is opposite to the body part of the plastic bottle preform below the handle. When the plastic bottle preform is heated, the external cooling water channel 4 and the internal cooling water channel 5 both cool the bottle mouth of the plastic bottle preform.

[0010] like Figure 3 As shown, stress release grooves 13 are provided on the horizontal plane of the first handle protection plate 8 and the horizontal plane of the second handle protection plate 3 to prevent the first handle protection plate 8 and the second handle protection plate 3 from deformation after high temperature.

[0011] A reflective plate 7 is also provided in the common heating area and on the reflective plate mounting frame 6. When the heating lamp in the common heating area heats the embryo body of the plastic bottle embryo, the thermal radiation light energy generated by the heating lamp will also penetrate the embryo body and irradiate onto the reflective plate 7. After being reflected by the reflective plate 7, the embryo body is heated for a second time. Due to the first handle protection plate 8, during the second heating, the first handle protection plate 8 will also block the mutual oblique reflection of the thermal radiation light generated at this time after reflection, so as to avoid the handle being affected.

[0012] The invention also comprises a reflection box 11, the reflection plate mounting frame 6 is connected to the reflection box 11, a embryo cooling fan 10 is arranged in the reflection box 11, and a plurality of cooling air channel holes 14 are arranged at intervals on the vertical surface of the first handle protection plate 8 and the vertical surface of the reflection plate mounting frame 6. By arranging the embryo cooling fan 10 and the cooling air channel holes 14, the embryo surface and the handle can be cooled to prevent the embryo surface from crystallizing, and the temperature of the inner wall of the plastic bottle embryo after heating is higher than the temperature of its outer wall. The plurality of cooling air channel holes 14 on the vertical surface of the first handle protection plate 8 and some cooling air channel holes 14 on the vertical surface of the reflection plate mounting frame 6 can be arranged relative to each other, or they can not be arranged relative to each other. In this embodiment, the relative arrangement is adopted to avoid the loss of cooling wind energy and ensure a good cooling effect.

[0013] An exhaust passage 15 communicating with the heating area is provided inside the heating box 1, so that the wind inside the heating area can be discharged out of the heating mechanism.

[0014] A blank mouth cooling fan 9 is arranged below the reflection box 11, and a blank mouth cooling wind box 12 is connected to the blank mouth cooling fan 9. The blank mouth cooling wind box 12 vertically penetrates the reflection box 11 and its air outlet is opposite to the bottle mouth of the plastic bottle blank, and cools the bottle mouth together with the inner cooling water channel 5 and the outer cooling water channel 4.

Claims

1. A preform heating mechanism with a handle, comprising a heating box (1) provided with a heating lamp and a heat insulation board (2) provided at the bottom of the heating box (1), a reflector mounting frame (6) opposite to the heating box (1) provided on the heat insulation board (2), an external cooling water channel (4) provided at the top of the heating box (1), an internal cooling water channel (5) provided at the top of the reflector mounting frame (6), a spacing between the external cooling water channel (4) and the internal cooling water channel (5) for the mouth of the plastic preform to pass through, and the heating box (1), the heat insulation board (2), the reflector mounting frame (6), the external cooling water channel (4) and the internal cooling water channel (5) enclose a heating area for heating the body of the plastic preform; Features: A first handle protection plate (8) is arranged on the reflective plate mounting frame (6), and a second handle protection plate (3) is arranged on the heating box (1). The first handle protection plate (8) and the second handle protection plate (3) are opposite to each other and there is a gap between the two for the bottle body of the plastic bottle preform to pass through. The first handle protection plate (8) and the second handle protection plate (3) divide the heating area into a low-temperature heating area and a normal heating area. The low-temperature heating area is opposite to the handle part of the plastic bottle preform, and the normal heating area is opposite to the body part of the plastic bottle preform below the handle. Stress release grooves (13) are arranged on the horizontal plane of the first handle protection plate (8) and the horizontal plane of the second handle protection plate (3). In the normal heating area and at the reflective plate mounting frame (6), the first handle protection plate (8) and the second handle protection plate (3) are opposite to each other. A reflective plate (7) is also arranged on the plate mounting frame (6), and also includes a reflective box (11), wherein the reflective plate mounting frame (6) is connected to the reflective box (11), a preform cooling fan (10) is arranged in the reflective box (11), a plurality of cooling air channel holes (14) are arranged at intervals on the vertical surface of the first handle protection plate (8) and the vertical surface of the reflective plate mounting frame (6), an exhaust channel (15) connected to the heating area is arranged inside the heating box (1), a preform cooling fan (9) is arranged below the reflective box (11), a preform cooling air box (12) is connected to the preform cooling fan (9), and the preform cooling air box (12) vertically penetrates the reflective box (11) and its air outlet is opposite to the bottle mouth of the plastic bottle preform.

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