CN1114931A - 一种生产塑料管的方法与设备和一种塑料管 - Google Patents
一种生产塑料管的方法与设备和一种塑料管 Download PDFInfo
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Abstract
本发明涉及一种生产一种塑料管的方法和设备以及一种塑料管。磨损的管路常衬以通常具有记忆性能的塑料管,以使塑料管在受热时膨胀。按照本发明,此记忆性能是通过使在管子成型装置(1)中的塑性材料(4)产生交联反应,然后将仍旧是热的的塑料管送入收缩模(5)而达到的。当管子(16)仍然处于塑性状态时,如果需要的话,可以将其在位于收缩模(5)后面的波纹制造器(8)中做出波纹。
Description
本发明涉及一种用于生产一种具有记忆性能,以致使其直径在受热时能加大的塑料管的方法,该种管子准备用于,举例来说,管路的衬里,其中,在管子成形装置中将塑性材料挤出并形成管子,然后使其通过一个模子,使管子的直径在其中收缩。本发明还涉及一种用于生产塑料管的设备和一种塑料管。
众所周知,可以通过用塑料管衬在磨损的管子中来修复污水管及其它管路。通常,都喜欢使衬管的外表面靠在已经修复的旧管的内表面上。但是在实践中却几乎不可能将一个能满足这个条件的衬管插入旧管中。因此,有一个众所周知的作法,即在将用作衬里的塑料管插入旧管之前,使塑料管的直径缩小。冷管的直径的收缩就赋予管子以一个记忆性能,这使得管子在受热时能恢复原有的管子直径。这样,当衬管处于一种收缩状态时,就可以将其插入旧管中,并且当它受热时,它就膨胀至原来的直径。用于此目的的热塑性塑料管通常由聚乙烯制成。
塑料管在收缩时通常使在一挤出机中生产出的管子冷却,然后将其拉拔,随后使其在一合适的地点通过一锥形收缩模。根据现有技术已经知道,此方法的最严重的缺点为,管子必须在挤出工序之后在一单独的工序中收缩,这增加了生产成本。该方法在收缩工序还需要大量的能量。
本发明的目的在于提供一种能生产具有永久记忆性能的塑料管的方法,而且该方法不包括单独的塑料管收缩工序。按照本发明的方法,其特征为,当材料处于管子成形装置中时,能在塑料中发生横向交联反应,以及当管子仍处于塑性状态时,使管子进入收缩模。
由于横向交联反应是在处于管子成形装置中的塑性材料中发生的,同时,由横向交联的塑性材料形成的软管是在管子成形工序之后立即受收缩的,因此,在一个唯一工序中如此获得的塑料管在随后的受热过程中就膨胀,基本上达到发生横向交联时所具有的直径。其能量消耗也低于现有技术的方法,这是因为,在塑性状态将材料收缩成较小的直径所需要的力小于收缩成品冷管所需要的力。
为了保证获得足够强的记忆性能,管子材料的横向交联度应当在5%和30%之间,最好为10%左右。如果将管子在其直径收缩时冷却,则管子的记忆性能将得到加强。
塑性材料的体积在收缩时不会改变,其结果将使管子的壁厚增加和/或在管子的直径减小时,使管子变长。由于管子在加衬时受热,管子相应地要变短,因此在管子受热时由于使管子长度减少了6%这么多,就会产生某些缺点。例如,如果污水管中的相邻污水井之间的距离为100米,并且污水管中衬有一长度相等的管子,则管子的长度将减少6米,其结果将是,举例来说,衬管与污水井的联接将变得相当困难。为了避免这一缺点,本发明的一个优选实施例的特点为,使塑料管从收缩模进入一波纹制造器,用以在至少一部分管子上制出波纹。当管子直径因受热而增加时,波纹会变得更加平缓,这增加了管子的长度。由于波纹增加了管子的长度,而管子的收缩则减少管子的长度,因此可以使这两个相反的作用相等,从而使衬管的长度在受热时保持不变。
在旧的管路系统中的管子上常常有孔,或者在加衬之后可能会形成孔洞。如果管路输送一种处于压力之下的液体,则衬管的壁厚必须做成使只靠衬管来承受管内的主要压力。根据本发明,增加壁厚的另一方法为用一种软管状的织物包住成品管,在受热后,该织物在直径等于管子外径时基本上是非弹性的。在多数情况下,这种织物的使用要比增加壁厚的方法明显地便宜。
本发明还涉及一种用于生产具有记忆性能,使得其直径在受热时能加大的塑料管的设备,该管子准备用于,举例来说,管路的衬里。该设备包括一将挤出的塑性材料形成管子的管子成形装置和一用于收缩管子直径的模子。
按照本发明的设备的特点为,收缩模位于紧接管子成形装置的地方;并且在收缩模之后装有一波纹制造器,用于在至少一部分塑料管子上做出波纹。
由于收缩模紧接在管子成形装置的后面,从收缩模中排出的塑料管仍然处于塑性状态,其塑性程度可使塑料管能在位于收缩模后面的波纹制造器中做出波纹。波纹使管子在加热过程中的变短以简单的方法得到补偿,从而使管子的长度在加衬时保持不变。
本发明还进一步地涉及一种具有记忆性能的塑料管,该管子的直径在管子受热时会加大,该管子准备用于,举例来说,管路的衬里。
按照本发明的塑料管的特点为,至少在一部分管子长度上将管壁做成波纹状。
下面将参考附图描述本发明,图中:
图1为按照本发明的设备的总垂直剖视图;以及
图2为按照本发明的一段管子的纵向剖视图。
图1示出了与一未示出的挤出机相连的管子成形装置1。管子成形装置包括一管状外模2和一同心地位于模子2的内部的圆柱形芯子3。从挤出机中排出的塑性材料用参考标号4标出。该设备还包括一具有一外管6和一内收缩芯7的管子收缩模5,内收缩芯7的形状为一截锥。收缩模5的外管6也是锥形的。零件6和7沿着设备的生产方向逐渐变细,其结果是使位于其间的塑料管的直径在离开管子成形装置1的方向上减少。
位于收缩模5之后的是一塑料管波纹制造器8。它包括顺序放置的激冷模9和10,其形状为半圆形,它们以下述方式放置,即环绕塑料管形成一封闭的模制空间,以使塑料管成形。激冷模9、10以某一方式沿着两条无端的路径移动,这样当它们处于环绕管子的位置时,它们能沿管子的生产方向移动,即从图1的左面移至右面。激冷模9具有波形的内表面11,而激冷模10则具有光滑的内表面12。在设备的中心线上装有一管子13,它在位于收缩芯7之后的一段上有许多孔14。在塑料管内,在管13的后端上,装有一用作塞子的圆板15。成品塑料管用参考标号16标出。
按照本发明,沿塑料管的移动方向看去,管子收缩模5基本上紧接在管子成形装置1的后面。另外,波纹制造器8位于与之靠近的收缩模5的后面。
图1所示的设备按下述方式工作。当材料位于管子成形装置1中时,在挤出机中,或在挤出机之前,将一种能使塑性材料发生横向交联反应的物质加在塑性材料中。举例来说,这种物质可以是过氧化物。在管子成形装置1中,合适的横向交联度在5%和30%之间,最好为10%左右。以塑性状态从挤出机排出的塑性材料4在外管2和芯子3之间通过管子成形装置1,在外管2与芯子3的影响下,塑性材料形成其壁光滑的管子。与此同时,在管子中发生上述的横向交联反应。在多数情况下,当管子在管子成形装置中时,横向交联反应并不完全,但是在收缩模5中或者甚至在波纹制造器8中,它仍继续进行。
从管子成形装置中出来的仍旧是热的塑性材料进入收缩模5,管子的直径在其中减小。从收缩模5中出来的仍旧处于塑性状态的管子进入波纹制造器8,在其中,管壁被从管13的孔14中流出的加压气体压靠在激冷模的内表面上。塞子15防止气体从管子内部逸出。从图1中可以看出,激冷模9的内表面是波形的,例如正弦波形,而激冷模10的内表面是平的,其结果将使成品管16在其一部分长度上是有波纹的,而在其它部分上则是光滑的,可参看图2。
收缩模5可以装有图上未示出的用于将管子冷却到某一程度的装置。按照本发明,可以与上面所说的截然不同,即使波纹制造器8的所有激冷模都与激冷模9相似,以使管子在其整个长度上都有波纹。
在按照本发明的方法中,可以省去波纹制造器8,由此只生产光滑的管子。这一方法不能为与衬里中的管子缩短有关的问题提供解决方法,但是它能以一种简单的低能量方式生产像聚烯烃管这样的对其直径具有记忆性能的横向交联塑料管。
按照本发明的一个实施例,管子16可以用软管状的织物17包住,在管子由于与加衬工序有关的受热而膨胀之后,该织物可以弹性变形至其直径与管子外径相等的程度,而在这个直径处,该织物则是非弹性的。因此,织物可以在管子的制造阶段紧紧地在管子周围与其相配,而当管子直径在因受热而加大时,它就伸展至所要求的直径。在采用这种织物时,塑料管的壁厚要做得小于未采用这种织物的管子所可能达到的厚度。如果需要的话,织物可以用塑料涂层予以保护,它在做出波纹后涂在织物上。
本发明还进一步地涉及一种具有记忆性能,使得管子在受热时直径加大,并且在至少一部分长度上做出波纹的塑料管子。这种管子的一个优点在于它的波纹补偿了管子在受热时的缩短,从而可使管子的总长度保持不变。这种类型的管子可以用图1所示的设备生产,而且,除了在管子成形装置中产生横向交联以外,还可以用其它方法获得记忆性能。一种方法是拉拔冷的光滑管,使其通过一收缩模,然后将其做出波纹,或是在管子为冷态时收缩做有波纹的管子。管子的做有波纹部分的长度相对于管子的总长度取决于管子的收缩度和波纹的波形。在多数情况下,最好将管子长度的10%至50%,最好是30%做出波纹。
部分或全部做出波纹的横向交联的塑料管也可以插入一最好是由金属如钢制造的无波纹的外管中。这种管件,举例来说,可以用于建筑物中的热水管路。由此,最好是通过使波纹比较平缓的塑料管产生所要求的纵向变形而受到预应力,然后将受到预应力的塑料管的两端安装在外管上。内管的预应力减少了由于温度变化而在管子轴向上产生的作用力,并且内管的波纹补偿了由于温度变化而引起的伸长或收缩。
本发明并不局限于用上述例子描述的实施例,而是可以在所附权利要求书的范围内有所变化。因此,塑性材料4在管子成形装置1中的横向交联度可以大大地超过50%。收缩模也可以在波纹制造器中延伸,并且塑料管可以在波纹制造器中借助于从管子外面产生作用的真空压靠在激冷模的内壁上,以代替内部的超压。激冷模9的内表面11也可以具有上述波形以外的其它形状。某些模子可以没有沟槽,同时上述表面可以有规律或无规律地以彼此相隔的长距离具有波纹形的沟槽。
Claims (13)
1.一种用于生产一种具有记忆性能,以致使其直径在受热时能加大的塑料管的方法,该管子准备用于,举例来说,管路的衬里,在此方法中,塑性材料(4)在被挤出后在管子成形装置(1)中形成管子,然后进入模子(5),在其中,管子的直径被收缩,其特征为,当材料处于管子成形装置(1)中时,在塑性材料中发生横向交联反应,并且在管子仍处于塑性状态时使管子进入收缩模(5)。
2.一种如权利要求1的方法,其特征为,从管子成形装置(1)中排出的塑料管(16)的横向交联度在5%和30%之间,最好为10%左右。
3.一种如权利要求1的方法,其特征为,管子(16)在其从管子成形装置(1)中出来以后,直接进入收缩模(5)。
4.一种如权利要求1的方法,其特征为,塑料管在收缩模(5)中冷却。
5.一种如权利要求1的方法,其特征为,塑料管从收缩模(5)进入一波纹制造器(8),用以至少部分地在管子上做出波纹。
6.一种如权利要求1或5的方法,其特征为,在成品管子的周围包有软管状织物(17),该织物在管子受热后在其直径等于管子(16)的外径处基本上是非弹性的。
7.一种用于生产一种具有记忆性能,以致使其直径在受热时能加大的塑料管的设备,该管子准备用于,举例来说,管路的衬里,所述设备包括用于使挤出的塑性材料(4)形成管子(16)的管子成形装置(1)和一用于收缩管子直径的模子(5),其特征为,收缩模(5)位于紧接管子成形装置(1)的地方;并且在收缩模(5)之后装有一波纹制造器(8),用于至少部分地在塑料管(16)上做出波纹。
8.一种如权利要求7的设备,其特征为,收缩模(5)具有用于冷却管子的装置。
9.一种具有记忆性能的塑料管,以致使管子的直径在受热时能加大,该管子准备用于,举例来说,管路的衬里,其特征为,管子(16)的壁至少在其长度的一部分上做有波纹。
10.一种如权利要求9的塑料管,其特征为,它由横向交联的聚烯烃制成。
11.一种如权利要求9的塑料管,其特征为,管子用软管状织物(17)包围,在管子受热后,该织物在其直径等于管子外径处基本上是非弹性的。
12.一种如权利要求11的塑料管,其特征为,软管状织物(17)在其直径未等于上述直径的地方是弹性的,从而在管子受热之前它就已经紧紧地包围管子(16)。
13.一种如权利要求9的塑料管,其特征为,它在两端安装在外管上。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94102593.4 | 1994-02-21 | ||
EP94102593A EP0668145B1 (en) | 1994-02-21 | 1994-02-21 | Method and apparatus for producing a plastic pipe and a plastic pipe |
Publications (2)
Publication Number | Publication Date |
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CN1114931A true CN1114931A (zh) | 1996-01-17 |
CN1074710C CN1074710C (zh) | 2001-11-14 |
Family
ID=8215704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN95102110A Expired - Fee Related CN1074710C (zh) | 1994-02-21 | 1995-02-21 | 一种生产塑料管的方法与设备和一种塑料管 |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0668145B1 (zh) |
JP (1) | JPH07266449A (zh) |
KR (1) | KR100333015B1 (zh) |
CN (1) | CN1074710C (zh) |
AT (1) | ATE194309T1 (zh) |
CA (1) | CA2143069A1 (zh) |
DE (1) | DE69425129T2 (zh) |
ES (1) | ES2148249T3 (zh) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100457420C (zh) * | 2002-10-31 | 2009-02-04 | 雷奥两合股份公司 | 过氧化交联的塑料模制件的挤塑方法 |
CN111002572A (zh) * | 2019-12-27 | 2020-04-14 | 阜南县顺昌塑业有限公司 | 一种波纹吸管弯管成型组件 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100863133B1 (ko) * | 2007-01-29 | 2008-10-15 | 김정환 | 보강 파이프의 나선 압입홈 성형장치 |
CN102774002B (zh) * | 2012-08-15 | 2015-01-21 | 刘晖 | 用模具制作异型聚四氟乙烯管的方法 |
DE102015115827B3 (de) | 2015-09-18 | 2017-02-16 | Unicor Gmbh | Vorrichtung zum Herstellen von Kunststoffrohren |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1310915A (en) * | 1969-12-16 | 1973-03-21 | Dunlop Holdings Ltd | Lined pipes |
DE2051390A1 (de) * | 1970-10-20 | 1972-04-27 | Ver Deutsche Metallwerke Ag | Verfahren zum kontinuierlichen Er zeugen von Rohren aus vernetzten Polyole fm Kunststoffen |
JPS5549218A (en) * | 1978-10-05 | 1980-04-09 | Sumitomo Electric Ind Ltd | Manufacturing method for heat recovery tube |
JPS5627317A (en) * | 1979-08-15 | 1981-03-17 | Showa Electric Wire & Cable Co Ltd | Manufacture of thermal expansion tube |
EP0252749B1 (en) * | 1986-07-11 | 1993-09-08 | Fujikura Ltd. | Apparatus for continuously producing heat-shrinkable crosslinked resin tube |
GB2272496A (en) * | 1992-10-31 | 1994-05-18 | Uponor Aldyl Ltd | Lining of elongate hollow member |
-
1994
- 1994-02-21 AT AT94102593T patent/ATE194309T1/de not_active IP Right Cessation
- 1994-02-21 ES ES94102593T patent/ES2148249T3/es not_active Expired - Lifetime
- 1994-02-21 EP EP94102593A patent/EP0668145B1/en not_active Expired - Lifetime
- 1994-02-21 DE DE69425129T patent/DE69425129T2/de not_active Expired - Fee Related
-
1995
- 1995-02-21 CN CN95102110A patent/CN1074710C/zh not_active Expired - Fee Related
- 1995-02-21 JP JP7055172A patent/JPH07266449A/ja active Pending
- 1995-02-21 KR KR1019950003300A patent/KR100333015B1/ko not_active IP Right Cessation
- 1995-02-21 CA CA002143069A patent/CA2143069A1/en not_active Abandoned
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100457420C (zh) * | 2002-10-31 | 2009-02-04 | 雷奥两合股份公司 | 过氧化交联的塑料模制件的挤塑方法 |
CN111002572A (zh) * | 2019-12-27 | 2020-04-14 | 阜南县顺昌塑业有限公司 | 一种波纹吸管弯管成型组件 |
Also Published As
Publication number | Publication date |
---|---|
EP0668145B1 (en) | 2000-07-05 |
JPH07266449A (ja) | 1995-10-17 |
ATE194309T1 (de) | 2000-07-15 |
KR950031452A (ko) | 1995-12-18 |
EP0668145A1 (en) | 1995-08-23 |
CA2143069A1 (en) | 1995-08-22 |
KR100333015B1 (ko) | 2002-11-22 |
ES2148249T3 (es) | 2000-10-16 |
DE69425129T2 (de) | 2001-03-29 |
DE69425129D1 (de) | 2000-08-10 |
CN1074710C (zh) | 2001-11-14 |
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