CN111251621B - 一种聚酯薄膜的生产工艺 - Google Patents
一种聚酯薄膜的生产工艺 Download PDFInfo
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- 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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- B29C48/92—Measuring, controlling or regulating
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- 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
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Abstract
本发明属于聚酯薄膜技术领域,具体的说是一种聚酯薄膜的生产工艺;本工艺使用的切缝设备包括底座,所述底座顶部固连有弯杆,弯杆顶部向一侧弯曲后并向下弯曲,且弯杆顶端固连有水平滑轨;本发明通过将横切刀使用液压杆安装在水平滑轨上,然后在横切刀底部安装有纵切刀,使纵切刀的尖端位于铸片上方靠近铸片边缘的位置处,然后控制液压杆下移,纵切刀能够向下切割铸片,切出一个口子后,使横切刀完全贯穿铸片,然后水平滑轨带动横切刀对铸片进行横向切割,当横切刀移动到铸片另一边缘处而未将铸片完全切断时,停止水平滑轨的工作,此时铸片两边缘处没有断开,收集辊收卷铸片时,不会造成断裂,提高了切片时的效率。
Description
技术领域
本发明属于聚酯薄膜技术领域,具体的说是一种聚酯薄膜的生产工艺。
背景技术
聚酯薄膜(PET)是以聚对苯二甲酸乙二醇酯为原料,采用挤出法制成厚片,再经双向拉伸制成的薄膜材料。聚酯薄膜、环保胶片、PET胶片、乳白胶片等印刷包装耗材,广泛用于玻璃钢行业、建材行业、印刷行业、医药卫生。聚酯膜又叫聚酯薄膜、光片、涤纶膜、感光纸、聚脂膜、苯锡膜、玻璃纸、离型膜。
由于对铸片后的聚酯薄膜进行切片时,都是通过收集辊将铸片收卷起来,然后在收卷过程中从一侧对聚酯薄膜进行切割,切割到一定程度后,停止切除,在两端切割处之间的位置即为一片聚酯薄膜,在收卷过程中,容易造成切开处的聚酯薄膜发生断裂,进而还需重新将聚酯薄膜缠绕在收集辊上,影响整体的切片效率,鉴于此,本发明提供了一种聚酯薄膜的生产工艺,其能够降低切片过程中断裂情况的发生,提高切片时的效率。
发明内容
针对现有技术的不足,本发明提供了一种聚酯薄膜的生产工艺,以解决上述背景技术中提出的问题。
为实现上述目的,本发明提供如下技术方案:一种聚酯薄膜的生产工艺,该工艺包括以下步骤:
S1:预结晶干燥,将聚酯熔体经预结晶干燥,控制聚酯熔体含水量在35ppm以下,同时结晶度为30-35%;预结晶温度为160-175℃,干燥温度为150-165℃,除湿温度为135-145℃,预结晶干燥时间为2.5-4.5小时;
S2:熔融挤出,挤出机预热段温度控制在260-270℃,熔融段温度控制在275-290℃,聚酯熔体经计量泵、过滤器和熔体线由模头挤出,挤出速度控制在36-40r/min;模头的模唇开度控制在2.0-3.5mm,模头挤出压力控制在30-60bar,挤出速度控制在36-40r/min;
S3:铸片,聚酯熔体经表面温度为25-30℃的冷鼓进行冷却,经过高压静电附膜系统,形成结晶度小于3%的铸片;先经过温度为25-30℃的冷鼓进行冷却后,能够使铸片更好的定型;
S4:纵向拉伸,铸片经预热后纵向拉伸,拉伸温度控制在78-85℃,冷却温度控制在25-40℃;先预热再拉伸,并保持拉伸温度在78-85℃,较好的保持铸片的柔韧性;
S5:横向拉伸,纵向拉伸后的铸片经预热后横向拉伸,拉伸温度控制在115-130℃,经热定型后进行逐步冷却至常温,控制聚酯薄膜结晶度达到50%以上;横向拉伸的温度比纵向拉伸的温度高,是因为先经过纵向拉伸后,拉伸的难度变大,因此将温度变大后,更好的对纵向拉伸后的铸片进行横向拉伸;
S6:牵引收卷切片,采用接触方式收卷,收卷压力比率控制在15-40%,张力比率控制在85-95%;并将在收卷过程中通过切缝设备进行切缝;通过切缝设备进行切缝,无需再对其进行切片,后续收集较为便利;
其中,S6中所述的切缝设备包括底座,所述底座顶部固连有弯杆,弯杆顶部向一侧弯曲后并向下弯曲,且弯杆顶端固连有水平滑轨;所述水平滑轨底部安装有液压杆,液压杆的输出端固连有横切刀,横切刀底部设置有纵切刀,纵切刀一端连接在横切刀的刀刃的底部位置处,且纵切刀另一端的高度比此端的高度低;所述横切刀底部分别设置有收集辊和导向辊,且导向辊位于收集辊前方,收集辊和导向辊均通过支撑杆安装在底座上方;使用时,由于对铸片后的聚酯薄膜进行切片时,都是通过收集辊将铸片收卷起来,然后在收卷过程中从一侧对聚酯薄膜进行切割,切割到一定程度后,停止切除,在两端切割处之间的位置即为一片聚酯薄膜,在收卷过程中,容易造成切开处的聚酯薄膜发生断裂,进而还需重新将聚酯薄膜缠绕在收集辊上,影响整体的切片效率;因此本发明主要解决的是如何降低切片过程中断裂情况的发生,提高切片时的效率;具体采取的措施及工作过程如下:通过将横切刀使用液压杆安装在水平滑轨上,然后在横切刀底部安装有纵切刀,在对铸片进行切割前,通过水平滑轨和液压杆的使用,使纵切刀的尖端位于铸片上方靠近铸片边缘的位置处,然后控制液压杆下移,纵切刀能够向下切割铸片,切出一个口子后,使横切刀完全贯穿铸片,然后再启动控制水平滑轨的工作,水平滑轨能够带动横切刀对铸片进行横向切割,当横切刀移动到铸片另一边缘处而未将铸片完全切断时,停止水平滑轨的工作,通过液压杆带动横切刀和纵切刀向上,从铸片上移出,此时铸片两边缘处没有断开,收集辊收卷铸片时,不会造成断裂,提高了切片时的效率;在将铸片收卷过程中,水平滑轨带动横切刀和纵切刀回到原位,进行下一次的切片操作,如此循环往复,将一整个铸片进行切片,而分成多个部分,每次使用,只需从切缝处撕开一个聚酯薄膜即可。
优选的,所述纵切刀铰接在横切刀刀刃的底部位置处,且纵切刀顶部远离铰接点的位置处固连有弧形杆,弧形杆顶端位于横切刀内部,且弧形杆底部固连有横杆,横杆两端底部均固连有辅杆,横切刀内部开设有弧形腔,辅杆底端位于弧形腔内部,弧形腔底部的横切刀上开设有吸气孔,吸气孔的底端朝向纵切刀的自由端;在纵切刀下移时,纵切刀会向下挤压铸片,同时铸片会对纵切刀有一个向上的反作用力,进而使纵切刀的自由端绕着铰接点向上转动,纵切刀会推动弧形杆向上,弧形杆会对东横杆向上,横杆会带动辅杆向上,辅杆底端在弧形腔内移动时,会通过吸气孔从下方向弧形腔内抽气,即会从铸片与纵切刀接触的位置处抽气,由于负压的作用,铸片会向上被抽动,进而铸片能够与纵切刀紧紧接触,纵切刀对铸片切割时,切割效率高,切割效果好。
优选的,所述横切刀前侧面和后侧面均固连有拉绳,每个拉绳上均穿有两个滚珠;纵切刀将铸片切割出一个口子,横切刀下移过程中,滚珠会被向下带动,最下方的滚珠越过切口处的铸片,到达铸片下方,此时同一个拉绳上的两个滚珠能够对铸片起到夹持作用,在横切刀对铸片进行横向切割时,两个滚珠能够保证被切割过的铸片处于水平状态,进而保证横切刀行进切割过程中,不会发生铸片的上下偏折的现象,而影响切割时的效果。
优选的,所述拉绳底端由弹性材料制成,用于在滚珠受到挤压时,滚珠能够向上移动;拉绳底端具有一定弹性后,在横切刀向下移动过程中,下方的滚珠先与铸片接触后,拉绳底端处能变长,滚珠进而能够在与铸片接触后向上移动,有一定的缓冲效果,防止滚珠下移时直接撞击到铸片上,影响铸片表面的完整性。
优选的,所述弧形腔内设置有弹性膜,弹性膜中部开设有条形开口;由于纵切刀在对铸片完全切割后,向上转动的纵切刀没有外力向上推动,此时,纵切刀的自由端会受到重力的作用向下转动,最终会在辅杆底端在弧形腔内向下移动时,弧形腔内的气体快速由吸气孔喷出,会对铸片有向下吹动的效果,影响横切刀水平切割铸片时的效果,因此在弧形腔内部设置有弹性膜,当辅杆首先脱离弹性膜向上运动后,在纵切刀的自由端向下转动时,辅杆会首先撞击到弹性膜上,由于有弹性膜的阻挡,能够降低辅杆的下移速度,当辅杆底端经过条形开口继续向下后,由于有弹性膜的摩擦作用,进一步降低了气体从吸气口吹出的速度,保证了横切刀水平切割铸片时的效果。
优选的,所述辅杆插接有底杆,底杆底端为一尖端,且底杆顶端能够在辅杆内上下移动;辅杆底端有能够沿其上下移动的底杆,底杆能够率先与弹性膜接触,底杆底端为尖端,能够保证底杆将条形开口打开,防止弹性膜影响辅杆的通过,同时底杆尖端完全向下越过弹性膜后,底杆会快速沿辅杆向下移动,底杆首先将弧形腔内的一小部分气体推出,底杆推动的气体的量较少,对铸片影响的效果小,然后底杆带动辅杆撞击到弹性膜上,使辅杆顺利通过弹性膜,进一步保证了辅杆的通过。
本发明的技术效果和优点:
1、本发明提供的一种聚酯薄膜的生产工艺,通过将横切刀使用液压杆安装在水平滑轨上,然后在横切刀底部安装有纵切刀,使纵切刀的尖端位于铸片上方靠近铸片边缘的位置处,然后控制液压杆下移,纵切刀能够向下切割铸片,切出一个口子后,使横切刀完全贯穿铸片,然后水平滑轨带动横切刀对铸片进行横向切割,当横切刀移动到铸片另一边缘处而未将铸片完全切断时,停止水平滑轨的工作,此时铸片两边缘处没有断开,收集辊收卷铸片时,不会造成断裂,提高了切片时的效率。
2、本发明提供的一种聚酯薄膜的生产工艺,通过液压杆推动纵切刀会向下挤压铸片,同时铸片会对纵切刀有一个向上的反作用力,进而使纵切刀的自由端绕着铰接点向上转动,纵切刀会推动弧形杆向上,弧形杆会对东横杆向上,横杆会带动辅杆向上,辅杆底端在弧形腔内移动时,会通过吸气孔从下方向弧形腔内抽气,即会从铸片与纵切刀接触的位置处抽气,由于负压的作用,铸片会向上被抽动,进而铸片能够与纵切刀紧紧接触,纵切刀对铸片切割时,切割效率高,切割效果好。
附图说明
下面结合附图对本发明作进一步说明。
图1是本发明的工艺流程图;
图2是本发明中使用的切缝设备立体示意图;
图3是本发明中图2的A部放大图;
图4是本发明中使用的切缝设备的主视图;
图5是本发明中图4的B部放大图;
图6是弹性膜的结构示意图;
图中:底座1、弯杆2、水平滑轨3、液压杆4、横切刀5、纵切刀6、收集辊7、导向辊8、弧形杆9、横杆10、辅杆11、弧形腔12、吸气孔13、拉绳14、滚珠15、弹性膜16、条形开口17、支撑杆18、底杆19。
具体实施方式
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体实施方式,进一步阐述本发明,本发明中前、后、左、右、上、下均是基于图4的视图方向。
如图1-6所示,本发明所述的一种聚酯薄膜的生产工艺,该工艺包括以下步骤:
S1:预结晶干燥,将聚酯熔体经预结晶干燥,控制聚酯熔体含水量在35ppm以下,同时结晶度为30-35%;预结晶温度为160-175℃,干燥温度为150-165℃,除湿温度为135-145℃,预结晶干燥时间为2.5-4.5小时;
S2:熔融挤出,挤出机预热段温度控制在260-270℃,熔融段温度控制在275-290℃,聚酯熔体经计量泵、过滤器和熔体线由模头挤出,挤出速度控制在36-40r/min;模头的模唇开度控制在2.0-3.5mm,模头挤出压力控制在30-60bar,挤出速度控制在36-40r/min;
S3:铸片,聚酯熔体经表面温度为25-30℃的冷鼓进行冷却,经过高压静电附膜系统,形成结晶度小于3%的铸片;先经过温度为25-30℃的冷鼓进行冷却后,能够使铸片更好的定型;
S4:纵向拉伸,铸片经预热后纵向拉伸,拉伸温度控制在78-85℃,冷却温度控制在25-40℃;先预热再拉伸,并保持拉伸温度在78-85℃,较好的保持铸片的柔韧性;
S5:横向拉伸,纵向拉伸后的铸片经预热后横向拉伸,拉伸温度控制在115-130℃,经热定型后进行逐步冷却至常温,控制聚酯薄膜结晶度达到50%以上;横向拉伸的温度比纵向拉伸的温度高,是因为先经过纵向拉伸后,拉伸的难度变大,因此将温度变大后,更好的对纵向拉伸后的铸片进行横向拉伸;
S6:牵引收卷切片,采用接触方式收卷,收卷压力比率控制在15-40%,张力比率控制在85-95%;并将在收卷过程中通过切缝设备进行切缝;通过切缝设备进行切缝,无需再对其进行切片,后续收集较为便利;
其中,S6中所述的切缝设备包括底座1,所述底座1顶部固连有弯杆2,弯杆2顶部向一侧弯曲后并向下弯曲,且弯杆2顶端固连有水平滑轨3;所述水平滑轨3底部安装有液压杆4,液压杆4的输出端固连有横切刀5,横切刀5底部设置有纵切刀6,纵切刀6一端连接在横切刀5的刀刃的底部位置处,且纵切刀6另一端的高度比此端的高度低;所述横切刀5底部分别设置有收集辊7和导向辊8,且导向辊8位于收集辊7前方,收集辊7和导向辊8均通过支撑杆18安装在底座1上方;使用时,由于对铸片后的聚酯薄膜进行切片时,都是通过收集辊7将铸片收卷起来,然后在收卷过程中从一侧对聚酯薄膜进行切割,切割到一定程度后,停止切除,在两端切割处之间的位置即为一片聚酯薄膜,在收卷过程中,容易造成切开处的聚酯薄膜发生断裂,进而还需重新将聚酯薄膜缠绕在收集辊7上,影响整体的切片效率;因此本发明主要解决的是如何降低切片过程中断裂情况的发生,提高切片时的效率;具体采取的措施及工作过程如下:通过将横切刀5使用液压杆4安装在水平滑轨3上,然后在横切刀5底部安装有纵切刀6,在对铸片进行切割前,通过水平滑轨3和液压杆4的使用,使纵切刀6的尖端位于铸片上方靠近铸片边缘的位置处,然后控制液压杆4下移,纵切刀6能够向下切割铸片,切出一个口子后,使横切刀5完全贯穿铸片,然后再启动控制水平滑轨3的工作,水平滑轨3能够带动横切刀5对铸片进行横向切割,当横切刀5移动到铸片另一边缘处而未将铸片完全切断时,停止水平滑轨3的工作,通过液压杆4带动横切刀5和纵切刀6向上,从铸片上移出,此时铸片两边缘处没有断开,收集辊7收卷铸片时,不会造成断裂,提高了切片时的效率;在将铸片收卷过程中,水平滑轨3带动横切刀5和纵切刀6回到原位,进行下一次的切片操作,如此循环往复,将一整个铸片进行切片,而分成多个部分,每次使用,只需从切缝处撕开一个聚酯薄膜即可。
所述纵切刀6铰接在横切刀5刀刃的底部位置处,且纵切刀6顶部远离铰接点的位置处固连有弧形杆9,弧形杆9顶端位于横切刀5内部,且弧形杆9底部固连有横杆10,横杆10两端底部均固连有辅杆11,横切刀5内部开设有弧形腔12,辅杆11底端位于弧形腔12内部,弧形腔12底部的横切刀5上开设有吸气孔13,吸气孔13的底端朝向纵切刀6的自由端;在纵切刀6下移时,纵切刀6会向下挤压铸片,同时铸片会对纵切刀6有一个向上的反作用力,进而使纵切刀6的自由端绕着铰接点向上转动,纵切刀6会推动弧形杆9向上,弧形杆9会对东横杆10向上,横杆10会带动辅杆11向上,辅杆11底端在弧形腔12内移动时,会通过吸气孔13从下方向弧形腔12内抽气,即会从铸片与纵切刀6接触的位置处抽气,由于负压的作用,铸片会向上被抽动,进而铸片能够与纵切刀6紧紧接触,纵切刀6对铸片切割时,切割效率高,切割效果好。
所述横切刀5前侧面和后侧面均固连有拉绳14,每个拉绳14上均穿有两个滚珠15;纵切刀6将铸片切割出一个口子,横切刀5下移过程中,滚珠15会被向下带动,最下方的滚珠15越过切口处的铸片,到达铸片下方,此时同一个拉绳14上的两个滚珠15能够对铸片起到夹持作用,在横切刀5对铸片进行横向切割时,两个滚珠15能够保证被切割过的铸片处于水平状态,进而保证横切刀5行进切割过程中,不会发生铸片的上下偏折的现象,而影响切割时的效果。
所述拉绳14底端由弹性材料制成,用于在滚珠15受到挤压时,滚珠15能够向上移动;拉绳14底端具有一定弹性后,在横切刀5向下移动过程中,下方的滚珠15先与铸片接触后,拉绳14底端处能变长,滚珠15进而能够在与铸片接触后向上移动,有一定的缓冲效果,防止滚珠15下移时直接撞击到铸片上,影响铸片表面的完整性。
所述弧形腔12内设置有弹性膜16,弹性膜16中部开设有条形开口17;由于纵切刀6在对铸片完全切割后,向上转动的纵切刀6没有外力向上推动,此时,纵切刀6的自由端会受到重力的作用向下转动,最终会在辅杆11底端在弧形腔12内向下移动时,弧形腔12内的气体快速由吸气孔13喷出,会对铸片有向下吹动的效果,影响横切刀5水平切割铸片时的效果,因此在弧形腔12内部设置有弹性膜16,当辅杆11首先脱离弹性膜16向上运动后,在纵切刀6的自由端向下转动时,辅杆11会首先撞击到弹性膜16上,由于有弹性膜16的阻挡,能够降低辅杆11的下移速度,当辅杆11底端经过条形开口17继续向下后,由于有弹性膜16的摩擦作用,进一步降低了气体从吸气口吹出的速度,保证了横切刀5水平切割铸片时的效果。
所述辅杆11插接有底杆19,底杆19底端为一尖端,且底杆19顶端能够在辅杆11内上下移动;辅杆11底端有能够沿其上下移动的底杆19,底杆19能够率先与弹性膜16接触,底杆19底端为尖端,能够保证底杆19将条形开口17打开,防止弹性膜16影响辅杆11的通过,同时底杆19尖端完全向下越过弹性膜16后,底杆19会快速沿辅杆11向下移动,底杆19首先将弧形腔12内的一小部分气体推出,底杆19推动的气体的量较少,对铸片影响的效果小,然后底杆19带动辅杆11撞击到弹性膜16上,使辅杆11顺利通过弹性膜16,进一步保证了辅杆11的通过。
使用时,由于对铸片后的聚酯薄膜进行切片时,都是通过收集辊7将铸片收卷起来,然后在收卷过程中从一侧对聚酯薄膜进行切割,切割到一定程度后,停止切除,在两端切割处之间的位置即为一片聚酯薄膜,在收卷过程中,容易造成切开处的聚酯薄膜发生断裂,进而还需重新将聚酯薄膜缠绕在收集辊7上,影响整体的切片效率;因此本发明主要解决的是如何降低切片过程中断裂情况的发生,提高切片时的效率;具体采取的措施及工作过程如下:通过将横切刀5使用液压杆4安装在水平滑轨3上,然后在横切刀5底部安装有纵切刀6,在对铸片进行切割前,通过水平滑轨3和液压杆4的使用,使纵切刀6的尖端位于铸片上方靠近铸片边缘的位置处,然后控制液压杆4下移,纵切刀6能够向下切割铸片,切出一个口子后,使横切刀5完全贯穿铸片,然后再启动控制水平滑轨3的工作,水平滑轨3能够带动横切刀5对铸片进行横向切割,当横切刀5移动到铸片另一边缘处而未将铸片完全切断时,停止水平滑轨3的工作,通过液压杆4带动横切刀5和纵切刀6向上,从铸片上移出,此时铸片两边缘处没有断开,收集辊7收卷铸片时,不会造成断裂,提高了切片时的效率;在将铸片收卷过程中,水平滑轨3带动横切刀5和纵切刀6回到原位,进行下一次的切片操作,如此循环往复,将一整个铸片进行切片,而分成多个部分,每次使用,只需从切缝处撕开一个聚酯薄膜即可。
以上显示和描述了本发明的基本原理、主要特征和优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。
Claims (5)
1.一种聚酯薄膜的生产工艺,其特征在于:该工艺包括以下步骤:
S1:预结晶干燥,将聚酯熔体经预结晶干燥,控制聚酯熔体含水量在35ppm以下,同时结晶度为30-35%;
S2:熔融挤出,挤出机预热段温度控制在260-270℃,熔融段温度控制在275-290℃,聚酯熔体经计量泵、过滤器和熔体线由模头挤出,挤出速度控制在36-40r/min;
S3:铸片,聚酯熔体经表面温度为25-30℃的冷鼓进行冷却,经过高压静电附膜系统,形成结晶度小于3%的铸片;
S4:纵向拉伸,铸片经预热后纵向拉伸,拉伸温度控制在78-85℃,冷却温度控制在25-40℃;
S5:横向拉伸,纵向拉伸后的铸片经预热后横向拉伸,拉伸温度控制在115-130℃,经热定型后进行逐步冷却至常温,控制聚酯薄膜结晶度达到50%以上;
S6:牵引收卷切片,采用接触方式收卷,收卷压力比率控制在15-40%,张力比率控制在85-95%;并将在收卷过程中通过切缝设备进行切缝;通过切缝设备进行切缝,无需再对其进行切片,后续收集较为便利;
其中,S6中所述的切缝设备包括底座(1),所述底座(1)顶部固连有弯杆(2),弯杆(2)顶部向一侧弯曲后并向下弯曲,且弯杆(2)顶端固连有水平滑轨(3);所述水平滑轨(3)底部安装有液压杆(4),液压杆(4)的输出端固连有横切刀(5),横切刀(5)底部设置有纵切刀(6),纵切刀(6)一端连接在横切刀(5)的刀刃的底部位置处,且纵切刀(6)另一端的高度比此端的高度低;所述横切刀(5)底部分别设置有收集辊(7)和导向辊(8),且导向辊(8)位于收集辊(7)前方,收集辊(7)和导向辊(8)均通过支撑杆(18)安装在底座(1)上方;
所述纵切刀(6)铰接在横切刀(5)刀刃的底部位置处,且纵切刀(6)顶部远离铰接点的位置处固连有弧形杆(9),弧形杆(9)顶端位于横切刀(5)内部,且弧形杆(9)底部固连有横杆(10),横杆(10)两端底部均固连有辅杆(11),横切刀(5)内部开设有弧形腔(12),辅杆(11)底端位于弧形腔(12)内部,弧形腔(12)底部的横切刀(5)上开设有吸气孔(13),吸气孔(13)的底端朝向纵切刀(6)的自由端。
2.根据权利要求1所述的一种聚酯薄膜的生产工艺,其特征在于:所述横切刀(5)前侧面和后侧面均固连有拉绳(14),每个拉绳(14)上均穿有两个滚珠(15)。
3.根据权利要求2所述的一种聚酯薄膜的生产工艺,其特征在于:所述拉绳(14)底端由弹性材料制成,用于在滚珠(15)受到挤压时,滚珠(15)能够向上移动。
4.根据权利要求1所述的一种聚酯薄膜的生产工艺,其特征在于:所述弧形腔(12)内设置有弹性膜(16),弹性膜(16)中部开设有条形开口(17)。
5.根据权利要求4所述的一种聚酯薄膜的生产工艺,其特征在于:所述辅杆(11)插接有底杆(19),底杆(19)底端为一尖端,且底杆(19)顶端能够在辅杆(11)内上下移动。
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