阅读说明：本技术 一种带肩托塑料瓶的吹塑成型工艺 (Blow molding process of plastic bottle with shoulder support ) 是由 张明威 于 2020-04-09 设计创作，主要内容包括：本发明公开了一种带肩托塑料瓶的吹塑成型工艺,包括以下步骤：步骤A,通过注塑模具成型带肩托瓶坯,带肩托瓶坯具有瓶坯螺牙、固定环、肩托以及坯身,带肩托瓶坯纵向拉伸伸长率不大于25％,横向吹胀为1.2至2.8倍；步骤B,传送带肩托瓶坯至瓶坯底座,利用瓶坯底座固定带肩托瓶坯；步骤C,瓶坯底座携带带肩托瓶坯经过加温区域,加温区域的温度范围为85至125°；步骤D,将瓶坯底座固定在吹塑模具中；步骤E,将吹塑模具安装在吹塑机中,由吹塑机对带肩托瓶坯进行机械式纵向拉伸,同时对带肩托瓶坯进行高压充气以成型带肩托塑料瓶。消除了肩托与瓶身错位,瓶身厚薄不均的问题,提高产品一致性及产品质量。(The invention discloses a blow molding process of plastic bottles with shoulder rests, which comprises the following steps: step A, forming a bottle blank with a shoulder rest through an injection mold, wherein the bottle blank with the shoulder rest is provided with a bottle blank screw tooth, a fixing ring, a shoulder rest and a blank body, the longitudinal tensile elongation of the bottle blank with the shoulder rest is not more than 25%, and the transverse blow-up is 1.2-2.8 times; b, conveying the bottle blank to a bottle blank base by a conveyor belt, and fixing the bottle blank base by using a bottle blank base fixing belt; step C, the bottle blank base carries the bottle blank with the shoulder support to pass through a heating area, and the temperature range of the heating area is 85-125 degrees; step D, fixing the bottle blank base in a blow molding mold; and E, mounting the blow molding mold in a blow molding machine, mechanically and longitudinally stretching the shoulder-mounted bottle blank by the blow molding machine, and simultaneously inflating the shoulder-mounted bottle blank at high pressure to form the shoulder-mounted plastic bottle. The problems of dislocation of the shoulder rest and the bottle body and uneven thickness of the bottle body are solved, and the consistency and the quality of the product are improved.)

1. A blow molding process of plastic bottles with shoulder supports is characterized by comprising the following steps:

step A, forming a bottle blank with a shoulder rest through an injection mold, wherein the bottle blank with the shoulder rest is provided with a bottle blank screw tooth, a fixing ring, a shoulder rest and a blank body, the longitudinal tensile elongation of the bottle blank with the shoulder rest is not more than 25%, and the transverse blow-up is 1.2-2.8 times;

b, conveying the bottle blank with the shoulder rest to a bottle blank base, and fixing the bottle blank with the shoulder rest by using the bottle blank base;

step C, the bottle blank base carries the bottle blank with the shoulder support to pass through a heating area, and the temperature range of the heating area is 85-125 degrees;

step D, fixing the bottle blank base in a blow molding mold;

and E, mounting the blow molding mold in a blow molding machine, mechanically and longitudinally stretching the bottle blank with the shoulder support by the blow molding machine, and inflating the bottle blank with the shoulder support at high pressure to form the plastic bottle with the shoulder support.

2. A process for blow molding a plastic bottle with a shoulder rest according to claim 1, wherein the shoulder rest is provided in a circular, oval, triangular or square shape.

3. A blow molding process of a plastic bottle with a shoulder rest according to claim 1, characterized in that in the step A, the drying temperature of the raw material for injection molding is 155-175 ℃, and the drying time is 4-6 hours.

4. A process for blow molding plastic bottles with shoulder rests according to claim 1, wherein in step C, the preform base is rotated around its central axis during movement at a speed of 13-17 rpm.

5. A process for blow molding plastic bottles with shoulder rests according to claim 4, wherein in step C, said heating area is provided with five sets of heating lamps, the first set of said heating lamps is set to a temperature of 75 to 105 degrees, the second set of said heating lamps is set to a temperature of 55 to 75 degrees, the third set of said heating lamps is set to a temperature of 60 to 80 degrees, the fourth set of said heating lamps is set to a temperature of 65 to 85 degrees, the fifth set of said heating lamps is set to a temperature of 70 to 90 degrees, the five sets of said heating lamps are arranged along the axial direction of said bottle blanks with shoulder rests, the first set of said heating lamps corresponds to the shoulder rests, and the fifth set of said heating lamps corresponds to the ends of the blank bodies.

6. A process for blow molding plastic bottles with shoulder rests according to claim 1, wherein in step E, the molding cycle is 10 to 15 seconds, the inflation pressure is 28 to 32bar, and the inflation time is 3.5 to 5 seconds.

7. A process for blow molding a plastic bottle with a shoulder rest according to claim 1, wherein in step a, a parting surface of the injection mold is arranged on the lower side surface of the shoulder rest, a bottle tooth insert for molding the bottle preform screw tooth is of a diagonal inclined mold opening structure, and the injection mold is of an open hot runner.

Technical Field

The invention relates to the technical field of plastic product molding, in particular to a blow molding process of a plastic bottle with a shoulder support by a two-step method.

Background

The two-step blow molding process is mainly used for molding thermoplastic plastic hollow containers such as PET, PETG, TRITAN and the like, and the two-step injection, drawing and blow molding process is more and more widely used, for example, cosmetic packages are also more and more used. The two-step blow molding process has the advantages of low investment cost and high efficiency. In the production of plastic bottles with shoulder supports, the existing two-step blow molding process is not applicable, and the problems of dislocation of the shoulder supports and the bottle body, uneven thickness of the bottle body and the like are easy to occur.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a blow molding process of plastic bottles with shoulder supports, which improves the consistency and quality stability of products.

According to some embodiments of the invention, the blow molding process of the plastic bottle with the shoulder support comprises the following steps: step A, forming a bottle blank with a shoulder rest through an injection mold, wherein the bottle blank with the shoulder rest is provided with a bottle blank screw tooth, a fixing ring, a shoulder rest and a blank body, the longitudinal tensile elongation of the bottle blank with the shoulder rest is not more than 25%, and the transverse blow-up is 1.2-2.8 times; b, conveying the bottle blank with the shoulder rest to a bottle blank base, and fixing the bottle blank with the shoulder rest by using the bottle blank base; step C, the bottle blank base carries the bottle blank with the shoulder support to pass through a heating area, and the temperature range of the heating area is 85-125 degrees; step D, fixing the bottle blank base in a blow molding mold; and E, mounting the blow molding mold in a blow molding machine, mechanically and longitudinally stretching the bottle blank with the shoulder support by the blow molding machine, and simultaneously inflating the bottle blank with the shoulder support at high pressure to form the plastic bottle with the shoulder support.

The blow molding process according to some embodiments of the invention has at least the following beneficial effects: by forming the bottle blank with the shoulder support, the longitudinal tensile elongation is limited to be not more than 25 percent and the transverse inflation is 1.2 to 2.8 times, and the plastic bottle with the shoulder support is formed by blow molding, so that the problems of dislocation of the shoulder support and the bottle body and uneven thickness of the bottle body are solved, the product consistency and the product quality are improved, the defective rate is reduced, and the production cost is reduced.

According to some embodiments of the invention, the shoulder rest is arranged in a circular shape, an oval shape, a triangular shape or a square shape, and the shape of the shoulder rest is selected according to the use requirement, so that the shoulder rest has strong universality and wide application range.

According to some embodiments of the invention, in the step a, the drying temperature of the raw material used for injection molding is 155-175 ℃ and the drying time is 4-6 hours, so as to reduce moisture and improve the cleanliness of the raw material.

According to some embodiments of the invention, in the step C, the preform base rotates around its central axis in the movement at a rotation speed of 13-17 rpm.

According to some embodiments of the present invention, in the step C, five groups of heating lamp tubes are disposed in the heating area, a first group of the heating lamp tubes is set to have a temperature of 75 to 105 °, a second group of the heating lamp tubes is set to have a temperature of 55 to 75 °, a third group of the heating lamp tubes is set to have a temperature of 60 to 80 °, a fourth group of the heating lamp tubes is set to have a temperature of 65 to 85 °, a fifth group of the heating lamp tubes is set to have a temperature of 70 to 90 °, and five groups of the heating lamp tubes are arranged along the axial direction of the bottle blank with shoulder rest, the first group of the heating lamp tubes corresponds to the shoulder rest, and the fifth group of the heating lamp tubes corresponds to the end of the blank body.

According to some embodiments of the invention, in step E, the forming cycle is 10 to 15 seconds, the inflation pressure is 28 to 32bar, and the inflation time is 3.5 to 5 seconds.

According to some embodiments of the invention, in the step a, a parting surface of the injection mold is arranged on the lower side surface of the shoulder rest, a bottle tooth insert for forming the bottle preform screw tooth is in a diagonal inclined mold opening structure, and the injection mold is an open hot runner.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic illustration of a bottle preform with shoulder rest in some embodiments of the present invention;

fig. 2 is a schematic representation of the structure of a blow molded plastic bottle with a shoulder rest according to some embodiments of the present invention.

The reference numbers are as follows:

bottle blank screw thread 101, fixed ring 102, shoulder rest 103, blank body 104.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.