CN105881854A - 一种pet饮料包装瓶胚生产工艺 - Google Patents
一种pet饮料包装瓶胚生产工艺 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76732—Mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76822—Phase or stage of control
- B29C2945/76859—Injection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/003—PET, i.e. poylethylene terephthalate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
本申请公开了一种PET饮料包装瓶胚生产工艺,包括选取原料,烘干原料,塑化熔融原料,注射成型,冷却定型和开模取出成品等步骤,通过在各个步骤中设置温度和时间参数,配合各步骤的装置,从而缩短成型周期,加快PET饮料包装瓶胚成品产出,减缓PET瓶胚的结晶速率,减缓PET饮料包装的粘度降,减少乙醛(AA)在生产过程中的产生含量,使粘度降控制在4%以内,乙醛(AA)含量控制在15ug/g以内,达到国家行业标准,同时避免出现白雾、气泡、水口长、穿孔、合模线粗、缺胶变形等吹塑时容易爆瓶的现象,生产的PET瓶胚成品的品质优良。
Description
技术领域
本申请属于瓶胚生产工艺技术领域,具体地说,涉及一种PET饮料包装瓶胚生产工艺。
背景技术
PET,全称为聚对苯二甲酸乙二酯,其分子结构高度对称,具有一定的结晶取向能力,故而具有较高的成膜性。同时,PET具有良好的光学性能和耐候性,非晶态的PET具有良好的透明度。另外PET具有优良的耐摩擦性、尺寸稳定性及电绝缘性。故用PET做成的瓶子具有良好的力学性能,且透明性好、无毒、防渗透、质量轻、生产效率高等优点,因而受到广泛的应用。
但PET原料颗粒受热后会加剧降解,增加粘度降,导致PET流体中低分子量链段的增加,低分子量链段起到成核剂的作用,使PET流体的结晶速率变快,同时会产生乙醛(AA),导致后续的PET瓶胚成品出现白雾、气泡、水口长、穿孔、合模线粗及缺胶变形等外观不良现象,同时吹塑时容易爆瓶。
发明内容
针对现有技术中的不足,本发明提供一种PET饮料包装瓶胚生产工艺。
为了解决上述技术问题,本申请揭示了一种PET饮料包装瓶胚生产工艺,包括以下步骤:
选取粘度为0.64dL/g~1.04dL/g,水份含量≤0.4%,乙醛(AA)含量≤1ug/g的PET原料颗粒;
干燥PET原料颗粒,干燥温度为160℃~175℃,干燥时间为4小时~6小时;
塑化熔融PET原料颗粒,形成PET流体,塑化温度为290℃;
注射PET流体进入模具,注射压力为90BAR注射速度为15g/s;
冷却模具至90℃,PET流体定型形成PET瓶胚成品,每克PET瓶胚成品冷却时间为0.1秒;
开模,取出PET瓶胚成品。
根据本申请的一实施方式,注射PET流体进入模具进行保压,保压压力为30BAR,保压时间为2秒。
本发明的PET饮料包装瓶胚生产工艺使得成品的成型周期缩短,耗能减少,加快成品产出,减缓PET的结晶速率,减小PET从原料颗粒到注塑成型的粘度降,使粘度降控制在4%以内,同时减少乙醛(AA)在生产过程中的产生,乙醛(AA)含量控制在15ug/g以内,达到国家行业标准,从而避免出现白雾、气泡、水口长、穿孔、合模线粗、缺胶变形等外观不良和吹塑时容易爆瓶的现象,生产的PET瓶胚成品的品质优良。
附图说明
此处所说明的附图用来提供对本申请的进一步理解,构成本申请的一部分,本申请的示意性实施例及其说明用于解释本申请,并不构成对本申请的不当限定。在附图中:
图1为本发明的PET饮料包装瓶胚生产工艺的流程图。
具体实施方式
以下将以图式揭露本申请的多个实施方式,为明确说明起见,许多实物上的细节将在以下叙述中一并说明。然而,应了解到,这些实物上的细节不应用以限制本申请。也就是说,在本申请的部分实施方式中,这些实务上的细节是非必要的。此外,为简化图式起见,一些习知惯用的结构与组件在图式中将以简单的示意的方式绘示之。
本申请提供一种PET饮料包装瓶胚生产工艺,请参阅图1,图1为PET饮料包装瓶胚生产工艺的流程图。如图1所示,执行步骤S1,对PET原料进行检测,选取粘度为0.64dL/g~1.04dL/g,水份含量≤0.4%,乙醛(AA)含量≤1ug/g的PET原料颗粒。接着执行步骤S2,将符合粘度标准和水份含量的PET原料颗粒置于转轮式除湿机的料桶内进行干燥。转轮式除湿机的转轮带动料筒转动,使得PET原料颗粒内的水份由于离心力的作用而甩至料筒内的空气中,料筒的内壁涂覆有多孔的合成硅胶,空气中的水份被吸附于合成硅胶上。为确保合成硅胶具有持续吸湿能力,在转轮的一端设置加热器,加热器的工作温度设定在160℃~175℃,加热器将空气加热至100℃~140℃,将加热后的空气传输至料筒,高温的空气接触到合成硅胶后,将吸水至饱和状态的合成硅胶上的水份蒸发汽化至空气中,通过风机将湿空气排出,从而使得合成硅胶恢复吸湿能力,确保转轮式除湿机可持续除湿。转轮以8转/小时~10转/小时的速度缓慢旋转,持续工作4小时~6小时,使得PET原料颗粒的含水率由≤0.4%降至≤0.004%,通过降低PET原料颗粒的含水量,防止PET原料颗粒在后续的熔解过程发生水解反应,避免结晶速率变快,防止粘度降超过4%,减少乙醛(AA)的产生,为PET原料颗粒进入注塑机进行塑化做好预热准备。
执行步骤S3,将干燥的PET原料颗粒注入注塑机中进行塑化熔融,设置注塑机的塑化温度为290℃,PET原料颗粒经过塑化后由固态达到熔融态,形成PET流体,将PET流体填充到注塑机的注塑室。注塑机采用无螺杆拉伸流变技术,即本注塑机的机身不含螺杆,相对于传统的采用螺杆挤出的注塑机的机身体积小,从而原料的热机械历程相比螺杆挤出的注塑机要缩短50%以上。通过将注塑系统优化设计为两级结构,第一级的功能为塑化挤出和输料功能,第二级的功能为计量和注射功能。在PET原料颗粒熔融塑化的过程中,形成的PET流体不断移向第二级的料筒前端,随着PET流体的增多,压力增大,从而推动混料的拉伸杆向后退。为了阻止拉伸杆后退过快,确保熔融的PET流体被均匀压实,在拉伸杆后退时施加与其后退方向相反的背压,从而阻止拉伸杆后退。背压设定在18BAR~30BAR,适当的背压避免PET原料颗粒塑化质量差、后续的射胶量不稳定,避免成品重量和成品尺寸变化大,同时避免后续的成品产生白雾或者气泡。在塑化的同时执行步骤S4,注射PET流体进入模具中,注射时,注射量由如下公式获得:1108X瓶胚重量(g)X模腔数/注射筒直径(mm)的平方,注射压力90BAR,由注射油缸推动注射活塞将熔融的PET流体以每秒每腔15g的速度注入到模具中。注射完毕后,执行步骤S5,对注塑后的模具进行保压,保持熔融的PET流体冷却收缩成固体时的内部压力,收缩率大约为13%,保压之后生产的成品才不会出现缺胶或变形现象,保压压力为30BAR,保压时间为2秒。保压完成后,执行步骤S6,通过冷水机对模具进行冷却,使得PET流体冷却成型为PET瓶胚成品。冷却水的进水压力6BAR~8BAR,温度为8℃~10℃。模具的成型腔内的零件配合处采用特殊表面处理技术,同时模具采用三轴冷却系统,提高了冷却时的热传导效率。根据瓶胚成品的重量设置冷却时间,每克PET瓶胚成品的冷却时间为0.1秒,冷却速度快,可在短时间内将模具的温度由290℃降至90℃。PET瓶胚成品冷却的同时开始结晶,通过瞬间快速对PET瓶胚成品进行冷却,使PET瓶胚成品的温度低于玻璃化温度点,其内部的分子链凝固,使PET瓶胚成品处于非晶态,成品呈现透明。冷却结束后,执行步骤S7,开模,通过机械手取出PET成品。机械手具有冷却装置,机械手上通有冷却水,机械手在拾取PET瓶胚成品时,对其进一步进行冷却,使得PET瓶胚成品的温度低于40℃,以防PET瓶胚成品温度过高出现粘胚,胚口碰伤和擦花现象。
综上所述,本申请的一或多个实施例中,本发明的PET饮料包装瓶胚生产工艺成型周期缩短,耗能减少,加快PET饮料包装瓶胚成品产出,提高生产效率,同时减缓PET瓶胚成品的结晶速率,使其从原料颗粒到注塑成型的粘度降稳定在4%内,减少乙醛(AA)在生产过程中的产生含量,乙醛(AA)含量控制在15ug/g以内,达到国家行业标准,避免成品出现白雾、气泡、水口长、穿孔、合模线粗、缺胶变形等外观不良和吹塑时容易爆瓶的现象,生产的PET瓶胚成品的品质优良。
上述说明示出并描述了本发明的若干优选实施例,但如前所述,应当理解本发明并非局限于本文所披露的形式,不应看作是对其他实施例的排除,而可用于各种其他组合、修改和环境,并能够在本文所述发明构想范围内,通过上述教导或相关领域的技术或知识进行改动。而本领域人员所进行的改动和变化不脱离本发明的精神和范围,则都应在本发明所附权利要求的保护范围。
Claims (2)
1.一种PET饮料包装瓶胚生产工艺,其特征在于,包括以下步骤:
选取粘度为0.64dL/g~1.04dL/g,水份含量≤0.4%,乙醛(AA)含量≤1ug/g的PET原料颗粒;
干燥所述PET原料颗粒,干燥温度为160℃~175℃,干燥时间为4小时~6小时;
塑化熔融所述PET原料颗粒,形成PET流体,塑化温度为290℃;
注射所述PET流体进入模具,注射压力为90BAR,注射速度为15g/s;
冷却所述模具至90℃,所述PET流体定型形成PET瓶胚成品,每克所述PET瓶胚成品冷却时间为0.1秒;及
开模,取出所述PET瓶胚成品。
2.如权利要求1所述的PET饮料包装瓶胚生产工艺,其特征在于,注射所述PET流体进入模具进行保压,保压压力为30BAR,保压时间为2秒。
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