CN111283986A - Bottle blank heating mechanism with handle - Google Patents

Abstract

A heating mechanism for bottle blank with handle features that the heating region is divided into a low-temp heating region and a ordinary heating region by the first and second handle protecting plates, the power of heating lamp tube in said low-temp heating region and the power of heating lamp tube in ordinary heating region are regulated to control the radiation energy and temp of heating lamp tube in each region to plastic bottle blank. The low-temperature heating of the handle part can be realized, so that the problem that the handle of the PET plastic bottle blank with the handle becomes soft and deformed due to heating is avoided, and the bottle blowing quality is ensured.

Description

A preform heating mechanism with handle

technical field

The invention relates to the field of bottle blowing processing equipment, in particular to a preform heating mechanism with a handle.

Background technique

At present, plastic bottles with handles (especially plastic milk bottles) on the market are roughly divided into HDPE plastic bottles with their own handles after integral molding and PET plastic bottles with rear handles with handles installed at the back. There are problems with plastic bottles. For HDPE plastic bottles, there are three problems: First, HDPE plastic bottles can only be formed by extrusion blow molding due to the material's molding properties (process flow: PE resin raw material → sol → parison extrusion → closed mold → Blowing → pressure holding → cooling → mold opening → product removal (subsequent trimming), etc.), the mold structure is complex and the cost is high. The cost of a single set of molds is more than double the cost of PET material molds, and the output is low; HDPE plastic bottles are not strong enough and are easily damaged. During transportation and storage, additional turnover boxes need to be added to store these HDPE plastic bottles, which not only increases the transportation cost of manufacturers, but also requires larger storage. space; third, there is a lot of waste, and the product needs to be trimmed later; fourth, there is a lot of resin material, and the resin material is 30% of the PET resin material of the same specification; fifth, the HDPE material has poor oxygen resistance, and the milk in it is easy to oxidize and deteriorate. For PET plastic bottles, it adopts injection stretch blow molding (technical process: PET resin raw material → drying → melting glue → high pressure injection molding → pressure holding → cooling → mold opening → embryo removal → tube blank temperature adjustment → mold closing → stretch blow molding → pressure holding → cooling → mold opening → product removal), although it can well solve the problems of the above-mentioned HDPE plastic bottles, and it has good sealing performance, strong bottle, high oxygen barrier performance, and easy transparency. However, at present, the handle of the PET plastic bottle needs to be produced by specific equipment and installed on the plastic bottle, so this also requires additional production costs. To sum up, technicians in the industry consider replacing the HDPE plastic bottle with its own handle with a PET material plastic bottle with its own handle. However, the PET material plastic bottle with its own handle is in the process of blowing. The handle does not participate in the blowing process. Therefore, during the heating process, the handle part of the plastic preform must be technically treated to prevent the handle part from being softened and deformed due to the high temperature during the blowing process. PET plastic bottle blowing failed.

SUMMARY OF THE INVENTION

The invention aims to provide a heating mechanism which can prevent the handle of the PET material preform with its own handle from being deformed due to high temperature during the blowing process.

The preform heating mechanism with a handle according to the present invention includes a heating box provided with a heating lamp tube and a heat insulation board arranged at the bottom of the heating box, and a heat insulation board opposite to the heating box is arranged on the heat insulation board. The reflector mounting bracket is provided with an outer cooling water channel on the top of the heating box, and an inner cooling water channel is provided on the top of the reflector mounting bracket, and between the outer cooling water channel and the inner cooling water channel, there is a hole for the bottle opening of the plastic preform to pass through. The heating box, the heat insulation board, the reflector mounting frame, the outer cooling water channel and the inner cooling water channel form a heating area for heating the bottle body of the plastic preform; the reflector mounting frame is provided with a first handle for protection The heating box is provided with a second handle protection plate, the first handle protection plate is opposite to the second handle protection plate and there is a space between the two for the bottle body of the plastic preform to pass through, the first handle protection plate The heating area is divided into a low temperature heating area and a common heating area with the second handle protection plate. The embryo body part is opposite.

In the preform heating mechanism with a handle according to the present invention, since a plurality of heating lamps are arranged on the side wall of the heating box from top to bottom, the heating area is heated by the first handle protection plate and the second handle protection plate. It is divided into a low temperature heating area and a normal heating area. The low temperature heating area is opposite to the handle of the plastic preform, and the normal heating area is opposite to the part of the embryo body below the handle of the plastic preform. You can adjust the heating in the low temperature heating area. The power of the lamp and the power of the heating lamp in the common heating area are used to control the radiation energy and temperature of the heating lamp in the respective area to the plastic preform. At the same time, due to the first handle protection plate and the second handle protection plate, Therefore, it can block the mutual direct thermal radiation of the heating lamps in the low-temperature heating area and the ordinary heating area, and also partially block the mutual oblique thermal radiation of the heating lamps in the low-temperature heating area and the ordinary heating area. The low temperature heating of the handle part of the plastic preform and the ordinary heating of the embryo body below the handle (ordinary heating is the normal heating that is higher than the temperature of the low temperature heating area). Because the low-temperature heating of the handle part can be achieved, the problem that the handle of the PET material plastic preform with its own handle becomes soft and deformed due to heating is avoided, and the quality of the blowing bottle is guaranteed.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a screenshot of the direction A-A in FIG. 1 .

FIG. 3 is a schematic structural diagram of the first handle protection plate and the second handle protection plate.

Detailed ways

A preform heating mechanism with a handle, as shown in Figures 1 and 2, includes a heating box 1 provided with a heating lamp tube and a heat insulation board 2 arranged at the bottom of the heating box 1, on the heat insulation board 2 A reflector mounting bracket 6 is provided opposite to the heating box 1, an outer cooling water channel 4 is arranged on the top of the heating box 1, and an inner cooling water channel 5 is arranged on the top of the reflector mounting bracket 6. The outer cooling water channel 4 and the inner cooling channel 5 are provided. There is a space between the cooling water channels 5 for the bottle mouth of the plastic preform to pass through. The heating box 1, the heat insulation board 2, the reflector mounting frame 6, the outer cooling water channel 4 and the inner cooling water channel 5 are enclosed for the plastic bottle. The heating area where the bottle body of the embryo is heated; a first handle protection plate 8 is arranged on the reflector mounting frame 6, 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 8 The plates 3 are opposite and there is a space between the two for the bottle body of the plastic 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 preform, and the common heating area is opposite to the embryo body part below the handle of the plastic preform. When heating the plastic preform, the outer cooling water channel 4 and the inner cooling water channel 5 both cool the mouth of the plastic preform.

As shown in FIG. 3 , stress relief grooves 13 are provided on the horizontal surface of the first handle protection plate 8 and the second handle protection plate 3 to prevent deformation of the first handle protection plate 8 and the second handle protection plate 3 after high temperature.

A reflector 7 is also provided on the reflector mounting frame 6 in the normal heating area. When the heating lamp in the normal heating area heats the body of the plastic preform, the thermal radiation energy generated by the heating lamp is also It will penetrate the embryo body and shoot on the reflector plate 7, and the reflector plate 7 will act to form a reflection and heat the embryo body for a second time. 8 will also block the mutual oblique shot after the reflection of the thermal radiation generated at this time, so as to prevent the handle from being affected.

It also includes a reflection box 11, the reflection plate mounting frame 6 is connected to the reflection box 11, and the body cooling fan 10 is arranged in the reflection box 11, on the vertical surface of the first handle protection plate 8 and the reflection plate mounting bracket 6 A plurality of cooling air passage holes 14 are arranged at intervals on the vertical surface of the cooling air. By arranging the body cooling fan 10 and the cooling air passage hole 14, the surface of the body and the handle can be cooled to prevent the surface of the body from crystallizing, and the temperature of the inner wall of the heated plastic preform is higher than the temperature of its outer wall. The plurality of cooling air passage holes 14 on the vertical surface of the first handle protection plate 8 and some of the cooling air passage holes 14 on the vertical surface of the reflector mounting frame 6 may be arranged opposite to each other, or may not be arranged oppositely. The relative setting can avoid the loss of cooling wind energy and ensure a good cooling effect.

The inside of the heating box 1 is provided with an air extraction channel 15 which is communicated with the heating area, and the air in the heating area can be discharged out of the heating mechanism.

Below the reflector box 11 is arranged a blank opening cooling fan 9, and the blank opening cooling fan 9 is connected with a blank opening cooling air box 12, the blank opening cooling air box 12 vertically penetrates the reflector box 11 and its air outlet is connected to the gap between the plastic preforms. The bottle mouth is opposite, and the bottle mouth is cooled together with the inner cooling water channel 5 and the outer cooling water channel 4 .

Claims (6)

1. A preform heating mechanism with a handle, comprising a heating box (1) provided with a heating lamp tube and a heat insulation plate (2) arranged at the bottom of the heating box (1), and a heat insulation plate (2) is provided at the bottom of the heating box (1). A reflector mounting bracket (6) opposite to the heating box (1) is provided on the upper part, an external cooling water channel (4) is provided on the top of the heating box (1), and an internal cooling is provided on the top of the reflector mounting bracket (6). Water channel (5), there is a space between the outer cooling water channel (4) and the inner cooling water channel (5) for the bottle mouth of the plastic preform to pass through, the heating box (1), the heat insulation board (2) , the reflector mounting frame (6), the outer cooling water channel (4) and the inner cooling water channel (5) form a heating area for heating the bottle body of the plastic preform; it is characterized in that: on the reflector mounting frame (6) A first handle protection plate (8) is provided, 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 the other is There is a space for the bottle body of the plastic preform to pass through, and 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 common heating area. The low temperature heating area is opposite to the handle part of the plastic preform, and the common heating area is opposite to the body part below the handle of the plastic preform. 2. A preform warming mechanism with a handle according to claim 1, characterized in that: stress is provided on the horizontal plane of the first handle protective plate (8) and the horizontal plane of the second handle protective plate (3). Release slot (13). 3. A preform heating mechanism with a handle according to claim 1 or 2, characterized in that a reflective plate (7) is also provided on the reflective plate mounting frame (6) in the normal heating area. 4. A preform warming mechanism with a handle according to claim 3, characterized in that it further comprises a reflection box (11), and the reflection plate mounting bracket (6) is connected to the reflection box (11), and is located in the reflection box (11). A body cooling fan (10) is arranged in the reflection box (11), and a plurality of cooling air passages 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). hole (14). 5 . The preform heating mechanism with a handle according to claim 4 , wherein an air extraction channel ( 15 ) communicated with the heating area is arranged inside the heating box ( 1 ). 6 . 6. A kind of preform warming mechanism with handle according to claim 4 or 5, characterized in that: below the reflection box (11), a cooling fan (9) for the opening of the embryo is arranged, and a cooling fan (9) for the opening of the embryo is arranged at the bottom of the reflection box (11). An embryo opening cooling air box (12) is connected to the top, the embryo opening cooling air box (12) vertically penetrates the reflecting box (11) and its air outlet is opposite to the bottle opening of the plastic preform.

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