CN115302739A - 一种冰箱用pet塑料制作工艺 - Google Patents
一种冰箱用pet塑料制作工艺 Download PDFInfo
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- 229920003023 plastic Polymers 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000001746 injection moulding Methods 0.000 claims abstract description 49
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 238000000071 blow moulding Methods 0.000 claims abstract description 9
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 75
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 75
- 239000000463 material Substances 0.000 claims description 37
- 238000007791 dehumidification Methods 0.000 claims description 18
- -1 polyethylene terephthalate Polymers 0.000 claims description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
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- 238000005516 engineering process Methods 0.000 claims 1
- 230000003749 cleanliness Effects 0.000 abstract description 4
- 238000010102 injection blow moulding Methods 0.000 abstract 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000004342 Benzoyl peroxide Substances 0.000 description 4
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
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- NQOLOKRMRGLSJU-UHFFFAOYSA-N (2,4-dibutylphenyl) dihydrogen phosphate Chemical compound CCCCC1=CC=C(OP(O)(O)=O)C(CCCC)=C1 NQOLOKRMRGLSJU-UHFFFAOYSA-N 0.000 description 2
- SPSPIUSUWPLVKD-UHFFFAOYSA-N 2,3-dibutyl-6-methylphenol Chemical compound CCCCC1=CC=C(C)C(O)=C1CCCC SPSPIUSUWPLVKD-UHFFFAOYSA-N 0.000 description 2
- INBMQYRWBRXTJA-UHFFFAOYSA-N C1(=CC=CC2=CC=CC=C12)S(=O)(=O)O.C(CCC)[Na] Chemical compound C1(=CC=CC2=CC=CC=C12)S(=O)(=O)O.C(CCC)[Na] INBMQYRWBRXTJA-UHFFFAOYSA-N 0.000 description 2
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- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
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- CKBGMDNHBCXFCI-UHFFFAOYSA-M sodium 4-(2-nonanoyloxyethoxycarbonyloxy)benzenesulfonate Chemical compound [Na+].CCCCCCCCC(=O)OCCOC(=O)OC1=CC=C(C=C1)S([O-])(=O)=O CKBGMDNHBCXFCI-UHFFFAOYSA-M 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
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- 238000004090 dissolution Methods 0.000 description 1
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- 239000005457 ice water Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
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- 229920001225 polyester resin Polymers 0.000 description 1
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- 238000004321 preservation Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical group [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 description 1
- 235000010234 sodium benzoate Nutrition 0.000 description 1
- 239000004299 sodium benzoate Substances 0.000 description 1
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
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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
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- 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
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- B29C45/27—Sprue channels ; Runner channels or runner nozzles
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Abstract
本发明公开一种冰箱用PET塑料制作工艺,先将注塑机注射的PET熔融塑料注入具有冷却装置的注塑模具中,通过急速冷却而成型出透明的管坯,然后将管坯送入加热装置进行二次加热,达到预设温度后将加热后的管坯放置在吹塑机的吹塑腔中进行吹拉成型,其特点在于,注塑机的注塑温度为260℃,PET熔融塑料从注塑模具的侧面注料,通过注塑模具的冷却装置将PET熔融塑料急速冷却至5℃,从而成型出透明的管坯,二次加热的预设温度为85℃。本发明一种冰箱用PET塑料制作工艺,改变了传统工艺的进料方式,得到的塑料制品表面无痕,透明度好,洁净度高。本发明还公开了一种由上述注吹制作工艺制作得到的制品,制品的表面无痕,更加美观。
Description
技术领域:
本发明涉及塑料加工技术领域,具体涉及的是一种冰箱用PET塑料制作工艺。
背景技术:
随着塑料及其制品的日新月异的发展,塑料加工制作逐渐发展成一个庞大的产业集群,几乎各行各业都在利用塑料制品,尤其是环保无毒的PET塑料制品成为用于许多应用的玻璃制品的替换物。“PET 里面有聚对苯二甲酸乙二醇酯,是热塑性聚酯中最主要的品种,英文名为Polyethylene terephthalate,简称PET,俗称涤纶树脂。它是对苯二甲酸与乙二醇的缩聚物,与PBT一起统称为热塑性聚酯,或饱和聚酯。
PET材料在市场上可以进行可回收处理,但透明PET注塑一直是行业内的难点,成型工艺的窗口相对很小,成型周期长,且报废率高。
发明内容:
本发明的目的在于提供一种冰箱用PET塑料制作工艺,改变了传统工艺的进料方式,得到的塑料制品表面无痕,透明度好,洁净度高。
为实现上述目的,本发明的技术方案是设计一种冰箱用PET塑料制作工艺,对透明PET材料进行除湿处理,然后将除湿处理后的透明 PET材料闭环输送至注塑机,通过注塑机对透明PET材料进行注塑成型,注塑成型完成后,通过机械手将注塑机上的注塑产品取下。
优选的,利用除湿干燥机对透明PET材料进行除湿处理。
优选的,除湿处理的工艺参数包括:除湿温度为140~160℃,除湿时间为4小时。
优选的,注塑成型的工艺参数包括:注塑速度为5~155mm/s,保压压力是注塑压力的75%,注塑时间控制在12S以内,成型温度在 260℃,模温50℃。
优选的,在注塑机的注塑模具中设置冷却水路。
优选的,按重量份计,透明PET材料由以下组分组成:
33份PET树脂,
6.1份2,2′-亚基甲-二(4,6-二正丁基苯酚)磷酸钠,
8份乙烯基三甲氧基硅烷,
1.6份正丁基萘磺酸钠,
2.8份三聚磷酸钠,
1.4份过氧化苯甲酰,
2.8份2-膦酸基丁烷-1,2,4-三羧酸,
3.2份氟硅酸钠,
6.5份甲醇聚氧乙烯醚磷酸酯,
3.5份二丁基羟基甲苯,
1.7份4-(2-壬酰氧基乙氧基羰基氧基)苯磺酸钠。
一种冰箱用PET塑料制作工艺,先将注塑机注射的除湿完毕的 PET熔融塑料注入具有冷却装置的注塑模具中,通过急速冷却而成型出透明的管坯,然后将所述管坯送入加热装置进行二次加热,达到预设温度后将加热后的所述管坯放置在吹塑机的吹塑腔中进行吹拉成型,得到所需的PET塑料制品,其特点在于,所述注塑机的注塑温度为260℃,PET熔融塑料从所述注塑模具的侧面注料,通过所述注塑模具的冷却装置将PET熔融塑料急速冷却至5℃,从而成型出透明的管坯,所述二次加热的预设温度为85℃。
进一步,所述注塑机包括注塑机料筒,所述注塑机料筒包括料嘴和与所述料嘴对接的模具热喷嘴,所述模具热喷嘴的一端具有料嘴承接口,将260℃的PET熔融塑料通过所述料嘴高压注入到所述模具热喷嘴中,所述模具热喷嘴外缠绕有加热圈,所述模具热喷嘴的热流道内设置有与所述热流道的形状相适配的加热棒。PET塑料在注塑成型过程中对料温是非常敏感的,注塑温度的偏差值不得超过±2℃,当注塑机的料嘴把260℃左右的PET熔融塑料注射到模具热喷嘴里,单靠模具热喷嘴外围的加热圈加热是无法保证PET熔融塑料的温度不下降,因此通过加热棒从模具热喷嘴的内部加热,这样就能保证PET 熔融塑料在成型前的温度不下降,控制其流动性,防止成型时管坯产生偏薄、白斑、硬点及溶解痕的缺陷。
另外,与热流道形状相适配的加热棒还起到导流作用,使得PET 熔融塑料能够沿着加热棒的外壁顺流而下,不会产生偏心,从而实现 PET熔融塑料的均匀加热。
进一步,所述模具热喷嘴的另一端设置有与其热流道相连通的出料口,所述注塑模具包括模坯和与所述模坯相配合的模腔,所述模坯设置在一可移动的模板上,所述模板上开设有一端与所述出料口相连通的横浇道,所述横浇道的另一端延伸至所述模坯的端口处,所述模坯和所述模腔之间形成有用于成型所述管坯的间隙,PET熔融塑料从模具热喷嘴的出料口通过横浇道流入模坯和模腔之间的间隙中,实现模坯的端口侧面注料,以达到隐形进料的目的。
进一步,所述加热装置为旋转式烤炉,所述管坯在所述旋转式烤炉内通过自身旋转实现均匀加热。
进一步,所述吹塑机包括拉伸装置和高压空气进气装置,所述拉伸装置包括定位杆和用于驱动所述定位杆在所述吹塑腔内上下移动的气缸,所述定位杆的杆头由聚四氟乙烯材料制成,所述高压空气进气装置包括空压机和固定在所述定位杆上的高压进气头,所述高压进气头的进气压力为16公斤。传统的定位杆的杆头由碳素钢制成,保温性能差,当定位杆的杆头接触二次加热后的管坯的底部时,管坯底部遇冷固化,会产生圈痕的瑕疵,而改用聚四氟乙烯制成的定位杆的杆头导热快,保温性能好,在拉伸过程中能够达到导热保温的最佳状态,保持恒定的温度,避免管坯的底部遇冷固化,不会出现圈痕的瑕疵,保证产品的最佳品质。
采用上述技术方案后,本发明一种冰箱用PET塑料制作工艺,其特点在于,改变了传统工艺中从模具顶端进料的方式,将PET熔融塑料从注塑模具的侧面注料,避免疤痕的形成,产品的洁净度高,通过控制注塑温度和冷却温度,使得产品成型时结晶少,透明度好,反之,控制不当易产生管壁偏薄、白斑、硬点且不透明的现象。
附图说明:
图1为本发明一种冰箱用PET塑料制作工艺中模具热喷嘴和注塑模具的结构示意图;
图2为本发明一种冰箱用PET塑料制作工艺中吹塑机的结构示意图;
图中:
模具热喷嘴1、料嘴承接口11
热流道12、出料口13
加热圈2、加热棒3
模坯41、模腔42
模板43、横浇道431
吹塑腔51、定位杆52
气缸53、高压进气头6。
具体实施方式:
为了进一步解释本发明的技术方案,下面通过具体实施例来对本发明进行详细阐述。
实施例一
为实现上述目的,本发明的技术方案是设计一种冰箱用PET塑料制作工艺,对透明PET材料进行除湿处理,然后将除湿处理后的透明 PET材料闭环输送至注塑机,通过注塑机对透明PET材料进行注塑成型,注塑成型完成后,通过机械手将注塑机上的注塑产品取下。
(1)优选的,利用除湿干燥机对透明PET材料进行除湿处理。
优选的,除湿处理的工艺参数包括:除湿温度为140~160℃,除湿时间为4小时。
优选的,注塑成型的工艺参数包括:注塑速度为5~155mm/s,保压压力是注塑压力的75%,注塑时间控制在12S以内,成型温度在 260℃,模温50℃。
优选的,在注塑机的注塑模具中设置冷却水路。
优选的,按重量份计,透明PET材料由以下组分组成:
33份PET树脂,
6.1份2,2′-亚基甲-二(4,6-二正丁基苯酚)磷酸钠,
8份乙烯基三甲氧基硅烷,
1.6份正丁基萘磺酸钠,
2.8份三聚磷酸钠,
1.4份过氧化苯甲酰,
2.8份2-膦酸基丁烷-1,2,4-三羧酸,
3.2份氟硅酸钠,
6.5份甲醇聚氧乙烯醚磷酸酯,
3.5份二丁基羟基甲苯,
1.7份4-(2-壬酰氧基乙氧基羰基氧基)苯磺酸钠。
具体步骤如下:;
(2)如图1所示,注塑机包括注塑机料筒,注塑机料筒包括料嘴和与料嘴对接的模具热喷嘴1,模具热喷嘴1的一端具有料嘴承接口 11,将260℃的PET熔融塑料通过料嘴高压注入到模具热喷嘴1中,模具热喷嘴1外缠绕有加热圈2,模具热喷嘴1的热流道12内设置有与热流道12的形状相适配的加热棒3,加热棒3从热流道12靠近料嘴承接口11的一端延伸至热流道12的另一端,PET熔融塑料在注塑成型过程中对料温是非常敏感的,注塑温度的偏差值不得超过± 2℃,当注塑机的料嘴把260℃左右的PET熔融塑料注射到模具热喷嘴1里,单靠模具热喷嘴1外围的加热圈2加热是无法保证PET熔融塑料的温度不下降,因此通过加热棒3从模具热喷嘴1的内部加热,这样就能保证PET熔融塑料在成型前的温度不下降,控制其流动性,防止成型时管坯产生偏薄、白斑、硬点及溶解痕的缺陷;
另外,与热流道形状相适配的加热棒3还起到导流作用,使得 PET熔融塑料能够沿着加热棒3的外壁顺流而下,不会产生偏心,从而实现PET熔融塑料的均匀加热;
(3)如图1所示,模具热喷嘴1的另一端设置有与其热流道相连通的出料口13,注塑模具包括模坯41和与模坯41相配合的模腔42,模坯41设置在一可移动的模板43上,模板43上开设有一端与出料口13相连通的横浇道431,横浇道431的另一端延伸至模坯41的端口处,模坯41和模腔42之间形成有用于成型管坯的间隙,PET熔融塑料经由加热棒3和加热圈2的共同保温后从模具热喷嘴1的出料口 13通过横浇道431流入模坯41和模腔42之间的间隙中,实现模坯的端口侧面注料,以达到隐形进料的目的;
(4)注入到注塑模具中的PET熔融塑料,通过冷却装置(注塑模具周围流动的冰水系统)的急速冷却冷却至5℃,从而成型出透明的管坯;
(5)透明的管坯送入加热装置进行二次加热,加热至85℃,加热装置为旋转式烤炉,管坯在旋转式烤炉内通过自身旋转实现均匀加热;
(6)如图2所示,将加热后的管坯放置在吹塑机的吹塑腔51中进行吹拉成型,吹塑机包括拉伸装置和高压空气进气装置,拉伸装置包括定位杆52和用于驱动定位杆52在吹塑腔51内上下移动的气缸53,定位杆52的杆头由聚四氟乙烯材料制成,高压空气进气装置包括空压机和两个对称固定在定位杆52上的高压进气头6,高压进气头6 的进气压力为16公斤,空压机将高压空气注入到吹塑腔51内,对管坯进行吹塑,得到与吹塑腔51形状相同的PET塑料制品;
拉伸装置的改进在于:传统的定位杆的杆头由碳素钢制成,保温性能差,当定位杆的杆头接触二次加热后的管坯的底部时,管坯底部遇冷固化,会产生圈痕的瑕疵,而改用聚四氟乙烯制成的定位杆52 的杆头导热快,保温性能好,在拉伸过程中能够达到导热保温的最佳状态,保持恒定的温度,避免管坯的底部遇冷固化,不会出现圈痕的瑕疵,保证产品的最佳品质。
采用上述技术方案后,本发明一种冰箱用PET塑料制作工艺,采用两步法成型工艺,其特点在于,改变了传统工艺中从模具顶端进料的方式,将PET熔融塑料从模坯的端口侧面注料,避免疤痕的形成,产品的洁净度高,通过控制注塑温度和冷却温度,使得产品成型时结晶少,透明度好,反之,控制不当易产生管壁偏薄、白斑、硬点且不透明的现象。
Claims (8)
1.一种冰箱用PET塑料制作工艺,其特征在于,对透明PET材料进行除湿处理,然后将除湿处理后的透明PET材料闭环输送至注塑机,通过注塑机对透明PET材料进行注塑成型,注塑成型完成后,通过机械手将注塑机上的注塑产品取下。
2.根据权利要求1所述的透明PET材料的注塑工艺,其特征在于,利用除湿干燥机对透明PET材料进行除湿处理。
3.根据权利要求2所述的透明PET材料的注塑工艺,其特征在于,除湿处理的工艺参数包括:除湿温度为140~160℃,除湿时间为4小时。
4.根据权利要求1所述,先将注塑机注射的PET熔融塑料注入具有冷却装置的模具中,通过急速冷却而成型出透明的管坯,然后将所述管坯送入加热装置进行二次加热,达到预设温度后将加热后的所述管坯放置在吹塑机的吹塑腔中进行吹拉成型,得到所需的PET塑料制品,其特征在于:所述注塑机的注塑温度为280℃,PET熔融塑料从所述模具的侧面注料,通过所述模具的冷却装置将PET熔融塑料急速冷却至5℃,从而成型出透明的管坯,所述二次加热的预设温度为85℃。
5.根据权利要求4所述的一种冰箱用PET塑料制作工艺,其特征在于:所述注塑机包括注塑机料筒,所述注塑机料筒包括料嘴和与所述料嘴对接的模具模具热喷嘴,所述模具热喷嘴的一端具有料嘴承接口,将260℃的PET熔融塑料通过所述料嘴高压注入到所述模具热喷嘴中,所述模具热喷嘴外缠绕有加热圈,所述模具热喷嘴的热流道内设置有与所述热流道的形状相适配的加热棒。
6.根据权利要求5所述的一种冰箱用PET塑料制作工艺,其特征在于:所述模具热喷嘴的另一端设置有与其热流道相连通的出料口,所述模具包括模坯和与所述模坯相配合的模腔,所述模坯设置在一可移动的模板上,所述模板上开设有一端与所述出料口相连通的横浇道,所述横浇道的另一端延伸至所述模坯的端口处,所述模坯和所述模腔之间形成有用于成型所述管坯的间隙,PET熔融塑料从模具热喷嘴的出料口通过横浇道流入模坯和模腔之间的间隙中,实现模具的侧面注料。
7.根据权利要求4所述的一种冰箱用PET塑料制作工艺,其特征在于:所述加热装置为旋转式烤炉,所述管坯在所述旋转式烤炉内通过自身旋转实现均匀加热。
8.根据权利要求4所述的一种冰箱用PET塑料制作工艺,其特征在于:所述吹塑机包括拉伸装置和高压空气进气装置,所述拉伸装置包括定位杆和用于驱动所述定位杆在所述吹塑腔内上下移动的气缸,所述定位杆的杆头由聚四氟乙烯材料制成,所述高压空气进气装置包括空压机和固定在所述定位杆上的高压空气进气头,所述高压空气进气头的进气压力为16公斤。
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